<s>[INST] I have grandchildren coming this weekend.  We have a 3 1/2 month old baby in one family and a seven year old from another family that had strep this week but has been on antibiotics since Monday, 4 days.  Is it okay to have the baby around the older child? [/INST] Hello. I just read through your question. The seven year old who has strep is not contagious as long as he has been on antibiotics for more than 24 hours and has not had fever for more than 24 hours. It seems from the information you've given that this is the case. So I have no concerns about the baby. </s>