During this trimester, your baby will: 1  Triple in length -- more or less -- from about 6 inches at week 14 or 15 to about 14 inches at 27 weeks. At the start of this trimester, she'll be about the size of a peach.
http://www.webmd.com/baby/features/pregnancy-stages-baby-body
== Answer == Because the baby inside of you is growing. What you eat goes to your baby. The stomach acts much like a balloon if you blow air into it. If it didn't the baby wouldn't have anywhere to grow and babys also move while inside the stomach.
http://www.answers.com/Q/When_does_your_belly_start_growing_when_your_pregnant
%DETAILS%       Answer     Every one is different. Some peoples' start to poke out by the 2nd or 3rd month whereas some peoples will not poke out until t…he 8th or 9th month if at all!     Answer     I carried my son for 9 months, and my belly button never poked out.
http://www.answers.com/Q/When_does_your_belly_start_growing_when_your_pregnant
During this trimester, your baby will: Triple in length -- more or less -- from about 6 inches at week 14 or 15 to about 14 inches at 27 weeks. At the start of this trimester, she'll be about the size of a peach. By the end, she'll be more like an eggplant.
http://www.webmd.com/baby/features/pregnancy-stages-baby-body
Best Answer: Your belly will start to grow in 16 to 20 weeks. Others can recognize you as a pregnant by 24 weeks. Fresh milk and orange juice are good. Food craving is normal in pregnancy. It can help you to ease constipation. Leafy vegetables are good. Don't take a wwhole meal, eat little by little.
https://answers.yahoo.com/question/index?qid=20080121235903AA9bJSN
29 Weeks Pregnant Belly Just like every child is different, it is not natural that every pregnancy is different. ... Belly in 39th Week of Pregnancy There are several changes that take place in a woman's body, during the course of her ... 15 Weeks Pregnant Belly In the 15th week of pregnancy, the baby is growing rapidly and his body with their organs... 8 Weeks Pregnant Belly At 8 weeks pregnant, a woman is most happy to have completed one fifth of her long ...
http://www.pregnancy-baby-care.com/conditions-during-pregnancy/belly-growth-during-pregnancy.html
During the next 13 weeks, your baby will: 1  Grow from a tiny cluster of cells called a blastocyst (about the size of the head of a carpenter's nail) at week three of pregnancy to about 3 inches long (think the length of your car key) by week 12.
http://www.webmd.com/baby/features/pregnancy-stages-baby-body
Your uterus grows along with your fetus, and by your 10th week of pregnancy, it will likely have swollen to the size of a grapefruit. Once you reach the 12-week mark, your uterus will probably have grown and protruded beyond the protective frame of your pelvis, but you still might not be visibly pregnant.
http://www.livestrong.com/article/551326-what-part-of-your-stomach-starts-to-get-big-first-when-you-are-pregnant/
Along with growth in your uterus and abdomen, expect some – or significant --growth and change elsewhere on your body. As the authors of What to Expect When You're Expecting point out, many women experience breast enlargement as one of the earliest signs of pregnancy, sometimes within days or weeks of conception.
http://www.livestrong.com/article/551326-what-part-of-your-stomach-starts-to-get-big-first-when-you-are-pregnant/
At some point during your fourth or fifth month of pregnancy, your uterus will begin pressing outward against your abdominal wall, and you’ll start to “show”. It’s difficult – if not impossible -- to correctly predict what part of your stomach will expand first.
http://www.livestrong.com/article/551326-what-part-of-your-stomach-starts-to-get-big-first-when-you-are-pregnant/
when does belly start to grow pregnancy
The  belly starts to grow in pregnancy in 16 to 20 weeks. Belly start to grows in pregnancy is between16  and 20 weeks.