G is only 3.5 months old, so we haven't had too many milestones yet! We're still working on getting her to giggle for anyone other than daddy (traitor!) and rolling is nonexistent. Sitting up, however, is her new all-time favorite thing to do.
She just adores when we prop her into the sitting position. She gives us the biggest grins ever, and has started to try and sit up on her own when we have her reclined on our legs or on a pillow. It's the cutest thing ever. I don't know if it's the thrill of doing something new, or being able to look at us from a new perspective (or maybe the huge amounts of praise we heap on her when she does it) but I can tell she really gets a kick out of it!
Were there any milestones that your LO particularly enjoyed?