I am so sorry is this your child ,granchild ,it must be worrying for you, sounds like they have him on meds so hopefully hes doing okay .here is a link to check out I hope its of help for you, http://www.cdcgov/groupbstrep/index.html I am uncertain about side effects, if you look in the search engine there is a lot to read ..good luck please let us know how baby is doing ..