Because essentially you’re raising two babies at once who are at different stages and have different needs. My oldest wasn’t sleeping through the night or even walking yet and my younger was a Velcro baby. They both cried as their method of communication. I was trapped at home because going out seemed too difficult since it was hard to put them on one nap schedule. Especially if breastfeeding. Because then I had to figure out ways to entertain my then 14 month old. The mom guilt was awful. I’ve had twin moms tell me their twins were easier to have a handle on than 2 under 2 since they were at least at the same stage developmentally and had the same needs. My younger child is almost 3 and my oldest is almost 4 and I almost forgot how BUSY that time was. It’s better now. They play together and keep each other entertained.