8 months. When she started crawling. But I'm waiting until a year this time around because my girls will have to share a room and because of sids

We just recently did it, before baby came along.

Both of the pediatricians I've seen with my son said to keeping him in the same room until he was at least one reduced the risk of SIDS significantly. But they both recommended I keep him in the same room until 18 months and if I did move him to keep a baby monitor next to my bed and pointed at his crib.