I went down a bit of a rabbit hole this morning studying male reactions to becoming fathers, and I found this article that cites a study that states that males who have higher testosterone are more likely to become fathers, but after all males studied became fathers their T-levels dropped sharply though temporarily.
They study authors concluded that the drop is caused by the need to adjust: "having a newborn baby require many emotional, psychological and physical adjustments"...
TLDR TLDR:
Want to maintain higher T-levels? Do manly things, and leave the baby stuff to your female.
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What if you goal in life is not to have high T levels but to be a good parent?
@shortstories If your objective in life is to have lower T levels and you are male, I do not recommend this course of action. A male can be a good parent to his children by being involved in their upbringing after they have reached the age that they are in primary school. Children only really need their mothers until then. The father's influence, in my opinion, should dominate their growth thereafter.
Investigate how it was done in Rome during the republic and the early empire.