Women's teams are more likely to concede goals in clusters as they are more emotional than men.
His side conceded four second-half goals in a loss to England.
Teams letting in another goal very quickly after giving up a first goal is a pattern that is found throughout the women's game.
He said that his team needed to get their emotional balance out of their heads.
Northern Ireland will not be able to qualify for the World Cup in Australia and New Zealand because of the defeat by the Lionesses.
A crowd of 15,348 watched Northern Ireland play in front of a record crowd at Windsor Park.
England went up by a goal in the 26th minute but had to wait until the 52nd to add a second.
England were struggling at times to open up until they went 2-0 up in the women's game.
If you go through the patterns, you will see that when a team concedes a goal, they concede a second one in a very short space of time. Girls and women are more emotional than men. They take a goal that isn't very well.
We tried to slow it down to give them time to get over it. That is an issue we have.
Not just in Northern Ireland, but all of the countries in the world.
The Irish Football Association has been contacted.