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have you had a feel of his gums? at the front. if you dont want to give calpol try calgel or bonjela, torub on the gums. i feel its better if they get teeth early, my dd had a tooth at 16 wks and she didnt have too much bother, i felt it was because her gums were softer.
there is something u can use its called ashton&parsons powder its really helpfull its in a blue and white box contains 20 sachets & shouldnt cost more than 1.99 you can get it from lloyds chemist or moss probably at most of them and dont know if you have a shop called savers where you are but you can get it there aswell