hi
45 days old child and you have tried 2 milk substitutes.avoid top feeding and absolutely no bottle.
regarding isomil causing infertility is toooo far fetched idea;its a soya based milk and is a lactose free milk substitute ,it has lesser
calcium as compared to other milks and can be used for 2 yrs continuously.there are no documented cases of infants getting infertile as adults if fed soya based formula when infants.