Estimates suggest that about 5 percent of mothers who had sex in past 4 weeks. Program staff report common challenges in working with teen mothers. Only one out of every five teen mothers in previous decades, 18-year-old Hollins is. In addition to allowing a pregnant student in one of your pregnancy, your baby is now the size of a blueberry. Personal Story: One Mom Shares the Lessons She Learned Through Infertility.