Your baby son's slighly sunken fontanelle may be normal for him. The usual cause of a definitely sunken fontanelle is diarrhoea with dehydration. Of course dehydration can result from fever or a baby not drinking enough as well.Antibiotics do not cause dehydration unless diarrhoea develops while on the antibiotic.The Probiflora drops are essential now. He is a bit young to be eating yoghurt. There does not appear to be any obvious cause for your son's slightly sunken fontanelle so this is most likely his normal appearance.
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