I bought this full body wetsuit for my baby (4 months old) that is starting his aquababies class.
In terms of size, the seller mentionned that in case of hesitation between 2 sizes, one should take the larger one. This was good advice. The 6 to 12 months wetsuit that I bought provide room for growth for my baby without being too large at this stage.
The wetsuit in itself is easy to put on onto the baby. It keeps baby warm: my baby was the only one not shivering in the pool at the first session.
The white elastic bands at wrists and ankles are not too tight so that blood circulation is impaired - but tight enough.
All in all a great product to confidently go swimming with your little ones. I will for sure make good use of it in the next few months.