This is very real and quite cute. Babies will try to imitate behavior and they often love music. If they see this type of dancing alot and like it they will do it. My 2 year is a very good dancer.
HE IS LIKE A MICHAEL JACKSON FROM BRAZIL
Take a look at a couple of funny video responses to our brazilian dancing samba baby so far! 
Go baby go!
I think it's real. Crappy video quality and I'm sorry but yes babies do shake and jump around like that all the time. The only thing is that it's surprising the kid would have such good rhythm and that they would wanna dance for that long AND their variation is just a bunch of typical moves that babies do or mimic from their parents but the timing when he switches movements is better than usual.
But I wouldn't say it's not possible that this is real.
Quite honestly, this is such a wonderful video. Now with respect to real or not, I will say without a doubt this is real. This is quite inspirational for young dancers to watch. 
That is so fake!
I think its a fake, so little baby can´t do one thing so much time.
I dance with children all the time..and when I go to trinidad every year they all have the same learned rhythm especiall from the dncing and the rhym of the drums out side in the streets. I,ve seen babies bob their heads and move their butts as young as 6 mos.
camera quality is bad but this is real
this kid is from northeast Brazil, where people dance like this all the time
he is just imitating
it's not that special

It's real, i'm brazilian and he is one normal baby with dance.
Simple it's brazilian baby dance better than you.
hahaha, BYE AMERICAN