You're not going to chestfeed your children!? What kind of father are you?
https://www.dezeen.com/2019/03/19/marie-claire-springham-chest-feed-hormone-kit/#:~:text=In%20both%20sexes%2C%20the%20hormone,side%2Deffects%20was%20inducing%20lactation.

Honestly though, after sucking my buddy's nipples for the first time, he got really into it. They got immediately hard when we went shirts off, he'd ask me to suck them and he'd like when I was squeezing and holding his chest when I was fucking him hard from behind.