There is no magic number here it would vary depending on the people. What i mean is, too many kids is when you cannot financially afford all of them or live within your means, it would be when you cannot provide the proper amount of time that each child requires, it would be when the children do not feel like something special in the family but rather is lost in the mix, it is when you need more outside help in caring for them each properly. So depending on the families situation this number would be different for everyone. For me and my hubby 2 children is all we want anymore then that would be to much for us.