Our son (7) has expressed a desire to take communion and be Baptist (praise God!). We have been holding off for now until we were sure of his desire as the communion aspect of it was definitely initially spurred on by a friend who partakes.
Over the last year he has pretended to take it with us and I've been supportive with him in it as I in no way want to deter him from wanting to join in. He's grown so much and it's becoming clear to me that his faith may be genuine. He understands the gospel and even prays through it at bed time. He knows the purpose of communion, not perfectly but clearly understands the main point.
Thoughts on letting him partake in communion? Especially before baptism? Thoughts on baptism? We're credo Baptists.
As a Baptist myself, we have kids taking communion and getting baptised. We do have a baptism class that everyone has to take before they can get baptised. And there are some discussions and so on, as to make sure people understand and also are sure they're ready to commit.
Personally, I think 7 is fine, as it's pure unadulterated faith, it can only make the child bond more with his family and the community. Not to mention the overwhelming love and support and how great the child will feel officially showcasing their faith and the church celebrating it with them.
As someone that tends to struggle with over-thinking or "analysis-paralysis" from time to time, I love how Jesus kept things simple and asked us to do the same, and including the kids when he was teaching.
As a lutheran myself, I cannot see any issues in kids taking communion. And kids getting baptized is no issue either. But I know baptists see this differently, so it's hard to answer for you :)
Have him baptised. Don't let him take the supper until that is done; one of the things it does is issue a call to join the church for the non-baptised, so... It's working.