Having babies close in age.

Sarah🍕 • 27. Married. Mommy to two boys. Artist. Atheist. Intactivist. Pro choice.
I just had my son December 17th, 2014. My husband is already talking about conceiving later on this year. He wants to get pregnant when our son is 8-10 months old. For those who have babies that close what are the pros and cons?