Not a solution to a problem relationship. Babies are lots of work and you need a supportive partner to help. It would be very unfair to the child

Just don’t do it. Don’t ever look at someone elses relationship and think “it worked for them, maybe it’ll work for me too”. What you don’t see is what happens behind closed doors. They could be estranged behind closed doors or worse. Maybe behind the scenes, they finally worked out their problems and a baby just happened to coincide with the timing.
If you have thought about doing this, talk to your partner, get counselling if needed, or just end it. A baby should not be brought into this world with fractured parents. You need to work together to raise a baby, even if you are baby Daddy aren’t together, you still need to have a amicable relationship.

The simple answer is, don’t do it. A new baby will not fix your relationship. Babies are a strain on a good relationship, so bringing one in to save a troubled relationship is just not going to work.
It’s also not fair on the child to bring them into the world for such a selfish reason, have a baby because you want one, not to save a relationship.

I wouldn’t recommend it. Having a baby is a lot of work and you need to be on the same page and working as a team.