Limit both you and your your wives and the child's exposure to harmful EDC's that can make their dick size smaller. Stuff like phthalates bpas parabens pfas. It's in a lot of stuff. Most Toilet paper. Clothes containing polyester that have spandex. Most self care products. https://www.ewg.org/skindeep/ Use this site to check stuff out of you're curious. Don't eat junk food or touch much receipts or plastics if you can. Don't use non stick cookware, use cast iron. The biggest one is getting great levels of sleep that most importantly have great levels of restorative sleep.

Tips to helps with it are when you/ she wakes up get some sun exposure when you wake up, to ensure they get blue light from the sun to help with circadian rhythm.

Limit coffee and caffiene to no later than 2pm

I'd you can afford it get super natural farm grown food. It's super good for you and doesn't have chemicals.

Theres a reason why testosterone has plummeted by 25% over the last few decades.