Pooping doesn't scare him anymore. He's got the basics of eating down, and he's starting to get the hang of sleeping. He's discovered that there are two very nice people in his world whose sole purpose is doing whatever it takes to keep him happy. And the world is you, at this point. Your baby is getting interested in the world around her.
Mirrors are particularly fascinating.
She plays a sort of game with my dad where he takes her to the mirror then pulls her back, then close again. Your baby will let you know when you re doing something she likes by smiling, laughing and squealing in delight. She's also learning how to tell you when playtime is over. If she's turning her head away or getting agitated, give her the down time she's telling you she needs. Your baby is not a helpless newborn anymore.