I've read some tips from a breastfeeding group. For inverted nipples. they suggest the use of breast shells, breast pump or syringe. Here's a site for breastfeeding basics when you have a flat or inverted nipples: https://www.breastfeedingbasics.com/articles/flat-or-inverted-nipples
I don't have an inverted nipple, but I have a flat one. What the lactation consultant did is use a syringe to suck the nipple before I feed the baby on our first couple of days after birth. Then the nipple come out after that, without the use of syringe.
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Same with Joey, the lactation consultant also used syringe to initially suck my nipple. Then after a few days, baby can feed without using syringe before feeding.