My granddaughter, Eliza Jean, is 4 1/2 months old. She thinks she is a big girl, and although she has great head control (I know, she is a genius baby), she can't sit up by herself yet. So she has this really cool chair called a Bumbo Seat. It's cushy foam plastic and you just kinda wedge her in there, and voila! She is sitting! Isn't she just so darn cute?!