With the bumbo seat, it is just trial and error. If she sits in it and holds her head up well then go for it. At first my daughter could only stand it for about a minute. Rolling over, anytime between 3-6 months is average, could be earlier could be later. My daughter would act like she was getting ready to do it and get close at 8 weeks but then she didnt do it till she was 13 weeks (and has not stopped since). Sitting up, I think anytime from 3-6 months also, sometimes earlier sometimes later. When my daughter went through physical therapy the PT told us that sitting up with support of hands usually will happen when she can push up onto her hands when on her tummy. My daughter just started sitting up with support of her arms and hands this week and she just turned 16 weeks. Every baby is different, just keep working with her and she will get it.
at 10:19 PM on Jun. 23, 2009