Things that my ever-so-gifted Animalia can do at 15 weeks (almost 4 months! holy shit!):
Drool a whole lot, smile, laugh, squeak, chirp, shriek happily, hold her head up high, sit up with help from pillows or hands, respond to us making faces at her, grab things, keep herself occupied for small periods of time, pull on things that make noise, press buttons that make noise, roll over from her back and from her tummy. She tries to lift herself up sometimes when she's laying down. She tries to crawl during tummy time (escape! escape!). She likes to be naked and makes happy sounds during diaper changes, then struggles when we're putting on the diaper. She's starting to play in the bath but she really didn't like bathing before. She's becoming more tolerant of clothing changes though still not a fan, I think this is related to her loving the nakedness. She sleeps through the night and I'm starting to be able to take a shower and get ready for the day while she sleeps in a little. Oh yeah, she loves books or anything with words on it.

Her tiny body isn't so tiny anymore, she's wearing a size 3-6 months, well, sort of. She's kind of skinny and if she weren't so long some of her 0-3 month clothes would still fit her. Her fingernails grow like crazy and I have to cut them every other day because she's always scratching her face. She only poops every few days. She has tiny nightmares sometimes and her face contorts like she's about to cry in her sleep, sometimes she wakes herself up in tears, sometimes she struggles through it and stays asleep. She notices the dog regularly now, she's still puzzled by him.

She loves TV. Not that we let her watch it but if it's on she'll crane her neck to be able to see it. She gets mad when we turn her head back toward us.

She likes to suck on socks.

She's showing an interested in what we eat.

She laughs whenever she sees me topless.

She makes herself fart by wiggling her legs and bending at the waist as well as she can.

She likes to stand when she's being held and will jump and try to take steps.

She just keeps getting bigger.