Pregnancy is the time when one or more offspring develops inside a woman. Pregnancy typically lasts 40 weeks from last menstrual period. About 213 million pregnancies occurred in 2012, 89% in developing world
Fetus is unborn mammalian offspring developing from embryo. Human fetal development begins 9 weeks after fertilization. Full-term fetus is between 37-40 weeks when sufficiently developed
Baby bump typically starts showing between 16-20 weeks of gestation. Second pregnancies may show bump earlier than first pregnancies. Pregnancy is most likely confirmed at week 4
Belly size depends on height, weight, bone structure, and muscle tone. Babies can emerge from smaller or larger bumps. Belly position matters more than baby size
Belly size doesn't affect baby's health or development. Fundal height measurements become important in second trimester. Belly appearance varies based on muscle tone, height, and previous pregnancies
Implantation occurs around 4 weeks, placentas begin to form. Nausea and morning sickness typically start between 5-8 weeks. Brain and spinal cord development begins at 6 weeks. Fingers, toes, and nails appear by 12 weeks. All major organs develop by 8 weeks