The infographic below fascinates me. I have three kids and they all have years of gaps between them. But if you look closely in the data below, in US alone, 1 person is born every 7.4 seconds! So I guess there are a lot of women getting pregnant and giving birth even if they apply a minimum two years gap per child, think about population explosion!!
Click here for larger image
Go to www.SonogramTechnician.org for similar resources