actually you can already see how many babies you get when you reach 8% which will be faster when quitting game and enter the same saved file
You can do it even faster than that. When you open up the menu, just look at the breast milk capacity. It goes up by 50 for each child you're carrying. So: 300 is 1 kid, 350 is 2, 400 is 3, and 450 is 4.
