Would i be overwhelming my child by sending him to enrichment class (Music Class, Gym Class ) at such a young age?

My daughter started Kindermusik at 5 months too and she loved it! Then again, she was always an active baby so it worked out for us. After her first class was when she started vocalising and making sounds! Coincidence or not, I think the class was more helpful than it was overwhelming (of course at some point in that first class, she did get sleepy and fussy). I guess just not too many classes at a time? Try 1 first and see what your child's response is. If he doesn't like it, try another one! If that still doesn't work, then maybe you can say that he's too young.