Cracked nipples
If a baby bottle is used and breastfeeding is done at the same time this may cause cracked nipples. This is because the sucking of a bottle is not the same as the sucking of a nipple. Bottle-feeding babies suck hard on the bottle. Breasfeeding babies use a different way to suck on the breast that is more gentle. Using a bottle makes the baby not want to breastfeed as much.