It’s your choice and really comes down to how your child will react. Some parents watch each session, some do not. We are happy for you to do either.
We find that during the first few weeks children typically benefit from parent observation and encouragement. However, in some cases children may interact more with the group if the parent leaves.
Each case is different and it's often a judgement call for both the parent and coach. As each child progresses often confidence increases and parents are able to gradually withdraw.
Please note: If your child is not potty trained you are required to stay!