My husband and I watch 90 Day Fiancé, and one of the guys was upset with his girlfriend because she was not giving him enough attention after giving birth and focusing all her attention on the baby

Now I’m watching Marriage Boot Camp, and another man said he felt his wife was not giving him enough attention after the baby.

Is this a real issue where some men feel insecure because they come second (or third) to the newborn? And is it possible that the women really isn’t giving the spouse enough time and attention after having children (specifically the first child).