With #1 you can rest when you need to, go to bed as early as you want and not have to get up a lot at night, with #2 you often don't get any rest during the day, have to look after a toddler, lift them up all the time, get up to them during the night and get minimal down time. No wonder it's harder! I was so exhausted with DD2 and I was bigger as well so I definitely did find it harder.