Ecology, Evolution and Genetics. Solutions to many of the world's most pressing environmental issues require a basic understanding of nature at the organismal, population and ecosystems level.
Average. On average, women start to show around the fourth month of pregnancy, between weeks 14 and 17. By week 17 the uterus usually has expanded to just an inch and a half below the navel, making the pregnancy more obvious.
  More details: When you are about 6 months, your body may start to prepare to begin milk production. Usually around 7 months, you will notice colostrum either leaking or expressed from the nipples. This is pre-milk, and for some women, it does not appear until after the birth of your baby.