If you have a good foundation for a relationship, an equitable partnership with open and compassionate communication, shared empathy, and respect for eachother, you are going to be in reasonably good shape.

The thing is, the process of having a kid is stressful, once they are here, it is physically taxing and can be emotionally draining. You don’t get sleep in regular or meaningful amounts or patterns, your pattern is disrupted but you also have to do all the other things you had to do before to maintin your life. Chores and work get less time and things pile up. Which makes it harder to do other things you have/want to do. Even if you find the time, you may not have the energy or mental capacity to do it. It can be a very lonely experience even with a good partner.

That said, if you remember, its you and your partner working together for the baby, for eachother, or against the problem, its manageable. You WILL need to adjust to it but it gets easier over time.