Actually, they have something the man puts on where a bottle can be dropped in and he can cradle the baby so it can drink. The milk can even be expressed milk from the mother. It is similar to the concept of the Empathy Belly that men can wear to be able to empathize with the challenges their wife is facing physically while she is pregnant.
Actually, the mother seahorse takes off and it is the father than remains and makes a bed for the chillun, feeds them, and protects them.
The males in many bird species participate equally in feeding the young.
For those who are spiritual, God compares himself to a nursing mother,
Isaiah 49 15 "Can a mother forget the baby at her breast
and have no compassion on the child she has borne?
Though she may forget,
I will not forget you!