Practising butterfly swimming

Niklas is doing his most favourite thing, bathing.
Today, he turned over from his stomach to his back for the 4th time, so now AJ (who saw it for the first time) is also convinced that it is not just luck. Clever little boy.
Now Niklas is 3740 grams (yes, our scales is that exact...) and he is either 50 or 51 cm, depending on how much you stretch his legs.