Holding your head up strong

Well little man is getting quite the neck muscles! He is starting to really push up and look around a lot while he is doing tummy time. And unlike a lot of babies he actually has come to enjoy tummy time a lot. He will just lay there for a while and not even try to pick his head up and then he starts to get curious and starts pushing up...usually it will only last for about 15 mins but its still fun to watch him. A lot of the time it ends with him rolling over onto his back and then screaming. I think he still shocks himself that he can do that. I can't believe he is almost 3 months old already! Where did the time go?!