7 ч 54 мин, 8 апр 2003 г. - Article : Fetal development, what happens during the third trimester?
Publisher : Mayo foundation for Medical Education and research
Article ;
Fetal development week by week Site : babycenter.org]
Article : Stages of Pregnancy Site : my.clevelandclinic.org
Article :The 1st trimester Site : mayoclinic.com