Help - my 4 1/2 month old son has been constipated for the last 5 days. he usually produces 1 dirty nappy per day but has now stopped. he is breastfed and i haven't eaten anything unusual for the last few days. he has been teething and putting fingers, bibs, toys etc. in his mouth. could this be a factor? does anyone know of a product which could be given safely? he has now started to throw up most of his feeds. i am not sure if this is due to the constipation or something else. he seems generally uncomfortable.