@asalia207 My nephew is 6 days older than my twin boys. My boys were born 3 months premature. My nephew did everything on time, and therefore first, until they were all a year old. My boys then walked first and used words first.
These days (2.5 years old), my nephew has a language delay and my boys are exactly average. But my nephew can jump and my twins can't. My boys sleep better because we sleep trained, but my nephew eats a LOT better.
All this to say, there will always be comparisons, someone always has to be first, but if you let the comparisons steal your joy or your ability to be present and celebrate your kids successes, then you're losing.
A lot of developmental changes happen in the first year, and you have to celebrate the successes without spending your energy on comparing your kid to someone else's. If you and your partner can't do that, then I recommend therapy.