baby is 4 months old

My baby daughter turned 4 months old on 22 November 2006. She learnt to flip over from back to stomach on this day. Two days before she turned 4 months, she was trying her best to flip and both me and my husband could see her efforts at it. She tried till her face turned red and was frustrated when she couldn't flip. But now she is really happy as she is successful in flipping. She likes to suck her fingers and makes cooing noises. She is a very cheerful girl and likes to smile a lot too. She has two favourite toys, an aeroplane-train and a clown which when taken from her, she will cry. And when the toys are given her back, she will smile again.