Only if unsupervised. It's very easy to underestimate how quickly things can change.

On a slightly more positive note, this is a clip from BBCs Fantastic The Human Body. It talks about and shows the natural abilities of babies to swim at a very early age. If you're politically correct/sensitive, you may want to skip it. It does show genitals. https://m.youtube.com/watch?v=fbSCSHzXkrI