For me...

Breastfeeding the first month with LO 1- I struggled and cried so much! I wasn't prepared for the learning curve and pain and I was an emotional wreck about my milk coming in so late.

Naps the first year with LO 1-She was a great night sleeper pretty early on but her naps when to shit when she got sick of the Snug a Bunny swing at 4.5 months. She fought naps a lot until she was maybe 13-14 months. Zzzzzzz

LO 2 projectile vomited a lot during her first 6 weeks. I changed so many sheets, clothes and took so many extra showers...yuck!