Can my baby can eat kiwi

Hi.my baby is not gaining weight.now he is 35 days old.still he is same as birth weight.he is not latching properly as u checked in articles that total aerolia,nipple needs to be in mouth .but my baby is sucking only nipple.what I need to do.my mil,hubby suggested formula milk from day 1 .my first baby was not taken my milk becoz of my inverted nipples.same was happened with my second one.i went to hospital for breastfeeding practice .finally he was taking my milk slowly from day 7.now he is not gaining weight.i think m useless mther fr my babies.i watched videos about good latch n tried.but no use.what should I do?

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