I have a 3 month old and this is something I am wondering about already, since I am definitely prone to YouTube binging - especially if I'm in a bad mood, tired etc.
I tell myself I need it for background music then before.I know it I'm binge watching comedy routines I've seen 10 times before.
You made it far enough to have life stable enough to post on HN and have a 3 month kid, I'd assume you're not actually addicted to youtube in the clinical term.
Honestly if you're going well enough, your kid potentially mimicking you shouldn't be such an issue. There are some stuff to consider regarding language aquisition, fine motor skills etc. for really small kids, but them looking at youtube wont doom their life if you've covered the other bases.
If you feel it will become a real issue, the path of course would be to look at how you want your own life to be different, move in that direction and bring your kid along. I've had friends who quit their job and moved to another town to realign with how they wanted their life to be after they had their kid, so it can be an option.
I tell myself I need it for background music then before.I know it I'm binge watching comedy routines I've seen 10 times before.