My son's pediatrician prescribed children's Zyrtec and antibiotic for my one year old is it okay to…

My son's pediatrician prescribed children's Zyrtec and antibiotic for my one year old is it okay to give infants ibuprofen at the same time ? It just seems like a lot of medicine at once for such a small baby . I'm probably just freaking out for no reason but I would like to know if there could be any side affects and if so what to look for .