We are getting him 'crib trained' and the last few days have put him in his crib for naps and for playtime with me right there. We also do 'tummy time' which he likes at the beginning then just wants to be held. His neck seems really strong for his age and he can keep it up decently (needs a little help still) and he rather sit up than lay in my arms. We introduced him to a rattle and he smiles at it, he started smiling before 6 weeks and it's the cutest thing. He also started cooing to us around 6 weeks, if I start singing he'll make noises along with me.
Ahh, I love him!