There is no such condition to breastfeed a baby. A woman can do this any time. It doesn’t harm the baby’s spirituality. Opinions that claim otherwise have no evidence. So rest assured. Things that affect on the babies’ spirituality are your behaviors and the things you teach them.
Ablution is only necessary for the prayers. The Messenger of Allah said:
“I’m commanded to perform an ablution only when I’m about to perform a prayer.” (Tirmidhi, At’imah/Foods, 40; Abu Dawud, At’imah/Foods, 11)