Yes... It really can. I was talking with a friend of mine who is another mom in transition - from one child to two - and the trend seems to be going from zero to one is hard, going from one to two can be like trying to move mountains and after that it's a breeze. I cannot speak of the breeze part yet but the mountains around our house can be quite large at times.
I think that bath nights ate the most difficult right now. Once the girls can be tossed in the tubbies together I imagine it will be a lot easier.
I know that I am part of the mountain though. I can get frustrated with E quickly because I expect more from her - even though I should not. When I look at her especially when she is asleep I see this big girl who I struggle to pick up compared to little peanut R. But I have to keep reminding myself that E is still a baby well a toddler and deserves to be treated like one - expectations just not super high expectations.
Fortunately my mother in law and my mom have given us a break but at the end of most days parenting for 2 is a game changer. I have no idea how twin parents survive but they do so I know even our most difficult days are really not as challenging as we think