It's really too early and there are too many variables to know what your kid's home life will be a decade+ from now. And it'll change with time depending on seniority, the particular job, and even his equipment/base and whether he commutes.
Others have given good advice, but I'll throw in a data point too. Over my aviation career (14 at the airlines), the issue hasn't been how
much I've been away, but the fact that when I'm gone, I'm gone. So as others said, you have to have a partner that's independent enough to be okay with that. My wife has only known me as a pilot, so she knew the deal when we met, and we've settled into a comfortable groove that works well for the family:
She's in the medical industry and works M-F, leaving the house around 7am and gets home at 6pm (occasionally a bit later if she gets held up at the hospital). I bid my month to leave around bedtime on Sunday and return by dinnertime on Tuesday. If I want to make more money I'll fly longer trips that get back early Wednesday (but I
will need to sleep until noon to recover!). Or mix and match, but generally I'll fly each week. I have a four year old daughter that goes to school from 9am-1pm M-F, and we have a nanny that holds down the fort when I'm gone. She also cleans the house and does laundry, etc while my daughter is at school, so that helps.
So from my daughter's perspective she loses me on Monday and most of Tuesday, sometimes all of Tuesday. But when she's not in school she gets 100% of me Wednesday-Sunday, with my wife joining in for bedtime and the weekend. My daughter's time at school gives me time for myself, to work on the honey-do list, etc. The routine seems to work well for us, and I certainly spend more time with my daughter than my wife, who has a more typical M-F job. On the flip side there are generally 8 nights per month where I'm not climbing into my own bed at night, and that sucks. And for some reason things only tend to break on the house, the car breaks down, or the dog starts puking on the rug when I'm 5000nm from home.