Priszcilla

I am exclusively breastfeeding my 3 month old and I am on day 21 of Whole30. My milk production regulated in this period, so I think that's why I don't have that much as before. My baby hasn't gained any weight in 2 weeks so I am concerned. What should I do? I feel good and I am loosing weight, but if this is affecting him I am not sure if I should continue? It's not my first Whole30. I did it twice before getting pregnant.