The author is a mom of 5 children, 5 years and under. She explains how she learned about the "bulk effect":
Our OB told us in advance that having the twins was not going to make us twice as busy (we had two at the time), but rather exponentially busy. Every time you add a child to your family. . . you are exponentially increasing.
I understand what she means. When Julia began going through the terrible two's, I didn't just have to train her. I had to train all of the other 6 to know how to correctly handle her fits, so that they weren't making it worse by giving in to her every time.
I had to learn how to hold Judah after nursing him so he doesn't spit up on himself. So I also had to teach 6 other baby-eager children how to hold him so he doesn't spit up on them either.
While there is much more child training, I also have a lot of help. I don't do anything alone.
A big family is big work. But oh such big rewards!