They say that being a mother changes you. A woman's body can show many physical changes after birth. According to the National Library of Medicine, no other time in your life will you grow a whole new organ, force your heart to pump more blood, and have alien cells hijack your brain.

Your little one is one of a few that are for keeps after birth. Here are 18 things that may never return to the way they were before you got pregnant.

1. Shoe size

Weight gain and hormones are the main reasons for the change in shoe size.

The American College of Obstetricians and Gynecologists says that women should gain between 25 and 35 lbs. Some women gain about half a shoe because of the extra weight that is carried around for the ten lunar months of pregnancy.

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The Journal of Bone and Joint Surgery states that relaxin plays a role. Relaxin helps relax the bones in the pelvis so the body can be elastic during labor. Dr. Leena Nathan, an assistant clinical professor of OB/Gyn at the University of California, Los Angeles, said that relaxin can cause a woman's feet to be more spread out.

New moms should get used to having larger shoe sizes, even after they lose weight and relaxin production stops, as these changes are permanent after birth.

2. Extra pounds

Feet on weighing scales

Weight gain from pregnancy can be temporary or permanent. (Image credit: Getty Images)

Extra pounds that don't have to be permanent are for many women.

There will be one in four women hanging onto 11 lbs. Live Science previously reported that it could be more than a year after giving birth. A woman will be between 2.5 and 5 lbs. after having a baby. Kathleen Rasmussen, a professor of maternal and child nutrition at Cornell University, told Live Science that she was heavier before she became pregnant. This number can become more significant when repeated for four or five babies.

3. Vaginal changes

It shouldn't be a surprise, given the average dimensions of a newborn's head, but women often have vaginal changes after giving birth. Most women will have a permanently larger vagina after they're born, according to the National Health Service.

There are many factors that contribute, including type of delivery, size of baby, genetic factors, and being overweight.

4. Wee problem

Incontinence

Giving birth can weaken muscles used for bladder control.  (Image credit: Getty Images)

One of the more unpleasant problems associated with squeezing an 8-lb. is that not all women face it. It is unfortunate that giving birth puts mothers at increased risk for incontinence or loss of bladder control. Vaginal delivery can weaken the muscles needed for bladder control and can damage bladder nerves and supportive tissue, leading to a dropped Pelvic Floor.

C-sections can increase the risk of incontinence.

He said that women with incontinence can strengthen their muscles with Kegel exercises. There is at least one device that allows people to use a phone and a small device to do Pelvic Floor exercises and get biofeedback.

5. Gain a child, lose a tooth

Gain a child and lose a tooth may be true.

The study found that women who had more children were more likely to have lost teeth. Women between the ages of 35 and 49 with one child lost an average of two teeth, while women with two children lost an average of four. Women with four or more children lost an average of seven teeth. Frequency of dental care didn't seem to be tied to this association

Nathan told Live Science that enlarged gums and more bleeding from gums during pregnancy are dental problems. The acid from vomiting can cause damage to the teeth.

During this time, it is important to practice good dental hygiene because of the Hormonal changes.

Women who don't have good dental health are at risk for preterm delivery, so it's important for them to get their teeth cleaned according to their schedule.

6. Growing and shrinking breasts

Breastfeeding

Breasts change to prepare for breastfeeding. (Image credit: Getty Images)

During and after a baby is born, a woman's breasts go through some changes.

They get bigger at first because the fat in the breast is being replaced by functional tissue in preparation for breastfeeding.

The functional tissue atrophies after a woman stops breastfeeding.

If the woman gets pregnant again, then the process will repeat, and if she gains a lot of weight after a pregnancy, then she will replace those fat cells in her breasts.

7. Sagging breasts

Ptosis is a term used for the side effect of pregnancy. The cause of breast droop is the stretching of the ligaments and elastin that hold the fat in place, according to a 2008 study.

Breast sagging is unlikely to get worse once you have had a baby. Breastfeeding isn't the cause of changes in breast size or shape, but weight gain, smoking status and additional pregnancies can make it worse.

8. Lower breast-cancer risk

Woman checking breasts

Chances of developing breast cancer may be lowered after pregnancy. (Image credit: Getty Images)

While breasts may be losing their fight against gravity, there is one fact that may perk you up: Breastfeeding may lower the lifetime risk of developing breast cancer. According to a 2002 review, a woman's risk of breast cancer drops by 4% for every year she nurses a baby.

The authors said that if women in developed countries had as many babies as they did in developing countries, the breast cancer risk could be cut in half. There are benefits to having fewer kids.

9. Stretch marks

Pink or red stretch marks can be seen on pregnant women's skin. People can get stretch marks if they experience a big increase or decrease in weight.

Over time, stretch marks fade out, so the good news is that. If the woman gets pregnant again, gains or loses a lot of weight, they may become more pronounced.

10. Hair growth

Baby holding woman's hair

After pregnancy, hair loss may be reduced.  (Image credit: Getty Images)

According to the International Journal of Dermatology, pregnant women notice that their hair is denser and lusher. Why does this happen?

The answer is related to hormones. Increased levels of hormones can lead to less hair loss during pregnancy. Women with a thicker head of hair may be pregnant.

After the birth of a child, hormones return to normal, and that luscious hair goes away.

11. Skin changes

There are a lot of skin changes when you're pregnant. The linea nigra is a dark, vertical line that runs over the belly to the pubic hair region during pregnancy. Sex hormones are likely to play a role in this change according to the Journal of the National Medical Association.

Melasma, which are brown patches on the face, may be developed by women who are pregnant. Freckles and moles can get darker during pregnancy.

The linea nigra and melasma are caused by an increase in the amount of melanin in your hair and skin. Some women with melasma can have dark patches for a long time after giving birth. Some women with melasma use sunscreen or wear a hat if they go outside, while others use skin lighteners after giving birth to address the dark patches.

12. Diabetes

Pregnant woman checking blood sugar

It is important to monitor blood sugar levels while pregnant. (Image credit: Getty Images)

According to the Centers for Disease Control and Prevention, up to 10 percent of pregnant women in the United States have elevated blood sugar. The mother's diabetes risk doesn't end when the baby is born. Up to half of the women who had gestational diabetes will develop type 2 diabetes later in life.

He said that those women already know they are at risk because of their family members with diabetes.

If a woman has gestational diabetes, it's important that she maintain a healthy weight and diet, monitor her blood sugar, and get screened for diabetes in the years following her pregnancy so she can be aware if she's becoming prediabetic.

13. Sex drive

It can take a year for a woman's sex drive to return to normal after she gives birth. One reason is fatigue from caring for a newborn. It has to do with breastfeeding.

If the woman is breastfeeding, she will have lower estrogen levels, which can diminish sex drive.

14. Varicose veins and hemorrhoids

Varicose veins

After pregnancy, varicose veins can appear in multiple areas of the body. (Image credit: Getty Images)

According to the British Medical Journal, pregnant women might notice swollen, sore and blue veins on their legs, as well as on the vagina. Hemorrhoids are veins that occur on the rectum.

The heavy weight and pressure of the uterus can reduce blood flow from the lower part of the body, which causes varicose veins and hemorrhoids. Increased blood flow and a weakened lining of the blood vessels can contribute to these conditions.

Within six to 12 months of the birth, hemorrhoids and varicose veins are usually gone. ACOG said pregnant women who want to prevent varicose veins from getting worse should exercise regularly, avoid sitting with their legs crossed for a long time, wear a support hose, and eat high-fiber foods and drink plenty of liquids.

15. Slightly larger uterus

The American Pregnancy Association says that the uterus swells to the size of a watermelon during pregnancy. It deflates and shrinks over the course of six weeks in a process called involution.

A 1996 study found that women who had children had larger uteruses than women who had never given birth. The uterus will shrink to a smaller size after menopause as it is not called permanent, just long- lasting.

16. Abdominal separation

Abdominal separation

Abdominal separation occurs in all pregnant during the late stages of pregnancy.  (Image credit: Getty Images)

According to the journal Current Women's Health Reviews, a condition called diastasis recti abdominis is one of the most common changes associated with pregnancy. A gap between the stomach muscles is created when the abdominal muscles separate.

This separation is necessary at the late stages of pregnancy to make room for the growing belly. Depending on the study, between a third and two-thirds of women will retain some separation between their abdominal muscles.

17. You become a chimera

A pregnant woman has cells from her baby in her body. Some of the cells leave with the baby. Some of those cells may stay in the mother's body for the rest of her life. The 2012 study found evidence of male DNA in the brains of women who had children decades before.

The purpose of these cells is not clear. Live Science reported that some doctors think they can help a mom, while others think the cells are harmful.

18. Wider hips

Measuring hips

More fat is sometimes deposited at the hips after pregnancy.  (Image credit: Getty Images)

Women who have had a baby may notice that their hips are wider. But why?

You may think it has to do with relaxin, a hormone that relaxes the joints and helps the mother push out the baby during labor. That is likely not the real reason for the wider hips.

He told Live Science that the deposition of fat into areas of the body that have extra fat cells is the reason for wider hips. Some women get bigger because of accumulating fat cells, not because their hip bones are wider.

Additional resources

You can read more about your body after birth. You can find out what helps your body bounce back after you have a baby.

Bibliography

Blood volume changes in normal pregnancies. The National Library of Medicine.

Weight gain during pregnancy. The American College of Obstetricians and Gynecologists is a group. There is a clinical guidance website.

The feet change in pregnancy. The Journal of Bone and Joint Surgery was published in 2008.

There are potential pathways between parity and tooth loss among American women. The American Public Health Associations published a report in 2007.

The Effect of Breastfeeding on Breast Aesthetics. The article is in the Aesthetic Surgery Journal.

Breast cancer and breastfeeding: collaborative reanalysis of individual data from 47 epidemiological studies in 30 countries, including 50302 women with breast cancer and 96973 women without the disease. The National Library of Medicine was founded in 2002.

A review ofStretch marks during pregnancy. The British Journal of Dermatology was published in the summer of 2014).

Morphology, growth rate, and thickness of the nail plate are related. The International Journal of Dermatology is a journal.

The incidence of lower mid-trunk hyperpigmentation is affected by sex hormone levels. The Journal of the National Medical Association was published in 2005.

Veins in pregnant women are called varicose Veins. The British Medical Journal was published in 1959

Sonographic size of uterus and ovaries in women before and after menstruation. There is an article titled "Ultrason in OB and Gyn" in the online library.

Effects on Musculoskeletal Function, Framework for Treatment and Implications for the Pelvic Floor are some of the topics covered in the book. Current Women's Health Reviews.