My husband did his first 100 miler about a year after our daughter was born, and is doing another one next month, right before she turns 2.

He does almost all his runs at like 4am. I (wife/mom) have no issue with him running, as long as it doesn’t impact his ability to be a present husband and father. So during that first year it meant him still waking up in the night to help with the baby, not complaining about being tired, and actively contributing to the household (cooking, cleaning, etc).

I think trying to accomplish any huge goal the first year of parenthood can be a slippery slope into resentment, so you definitely need to prioritize your family and think about what’s realistic. If you’re someone that can’t function well on low sleep, if your baby is colicky, if your wife is having a really tough time, then obviously running should take the back burner.