Biology is biased. Basic stuff, pregnancy and lactation. Then there are emotional issues, the special bond between the mother and her infants, which can lead to life-long emotional disability issues, if not handled properly.

See e.g. https://positivepsychology.com/attachment-theory "This provided a clear indication that emotional attachment in infancy, gained through cuddling, affected the monkey’s later responses to stress and emotion regulation (Herman, 2012)."

Sadly, we run our society by Powerpoint, obsessively focusing on a handful of poorly measured metrics. We have trained entire generations to reflexively point out any differences in those metrics as "bias", with a very negative connotation. Edit: Consider using a less charged word, e.g. "difference".

It is only human to give women space to be women.