I don't know if this falls under milestones, but Little Miss K is exhausting me these days since she has learned how to use her little muscles to straighten her legs and arch her back! She just turned 3 months and I wasn't expecting this so soon, but she is already trying to "pop" out of her swing and car seat. Forget the bouncy chair, she'll slide right out. And she is fighting any time I have to buckle her into any kind of seat, with this afternoon's car seat entrapment causing her to almost slide out of the seat and making her pissed! I swear she uses her feet and legs to push off the seat already!

Please tell me this is normal, it won't last long, and how to get your baby to willingly stay in a seat? Mama is tired!

ETA: pic