Three!  I come from a family of 3 girls, and I have 3 kids.

If you've got two siblings, how about you all throw in a little extra for your Mother's Day present this year. Because it turns out your mom had it WORSE than you realized.

A new survey asked more than 7,000 mothers to name the most stressful number of kids. And the answer is . . . THREE. Exactly three.

Mothers with three kids stress out more than moms with one or two,but also stress out more than moms with four or more. Apparently once you have four kids, you hit a critical mass that somehow makes things less stressful.

60% say raising girls is more stressful than raising boys. 46% of women say their husbands cause them more stress than their kids do.  (Hahahahahaha!  True!)

The survey also found the average mom ranks her stress level at an eight-and-a-half out of 10. The biggest cause of stress is not having enough time to do anything.

And finally, in a vicious cycle, 72% of moms say they stress out about how stressed out they are.