With my little girl turning 1 I shall share.
This year has been insane in so many ways but the one HUGE thing I wish I knew was more about allergies. They are amazingly more common now than they were years ago and I was one of those people who were like "WTF if you have a peanut allergy stay away from peanuts and don't be a baby" .. fast forward to having our first child...
She was allergic to milk, soy, peanuts, and egg (and probably other things too!). If you think about what you eat down to the tiniest of ingredients this pretty much sums up EVERYTHING. Wife was breastfeeding so anything she ate the baby got. Spent the first 4 months trying to figure out why our child was so unhappy, crying constantly, could not sit still EVER, impossible to get to sleep, screamed bloody murder instead of crying. Seriously never heard a "cry: until 5 months.. just death screams CONSTANTLY.. no silence... ever....
Finally got a blood test for allergies even though the doctor swore there was nothing wrong and allergies were impossible. Came back positive for all of the mentioned foods. Eliminated from Mom's diet and happy baby emerged. Simple as that but imagine spending 4 months not liking your baby AT ALL because all she did was scream and yell and scream and NOTHING and I mean NOTHING made her happy/quiet. Most stressful times ever, but now we are stronger people and more educated on the whole allergy thing.
I'm sure this story was too long and boring but it was life changing for my wife and I and as 2 scientists its insane how long it took us to figure it all out as it's all so tricky (milk protein stays in your system for >2 weeks!).
Good luck with your new addition, they are a wonderful thing
Everyone has issues to deal with in the first year but you are so sleep deprived and trying to survive that you forget all of it within months time, I promise.