Share 'Question about kids sharing rooms...'

Hey Everyone! I have a question.... I want the girls to start sharing a room soon since we have a little boy on the way (yay!). One is 2 1/2 (sleeps in toddler bed) and the other is 14 months (still in crib). Kinsey (2) talks/plays/sings before she goes to bed and Keegan (1) goes to sleep right away. I am concerned if I put them together...they will end up playing instead of sleeping and when one…