The 2nd trimester spans from 13 to 28 weeks of pregnancy and is often considered the most enjoyable trimester.
Your baby grows rapidly in length and weight from the beginning to the end of the 2nd trimester:

From 3 inches to about 12 inches long
From 1 ounce to about 1½ pounds

The nausea (?morning sickness?), sleepiness, fatigue, and nipple tenderness that occurred during the first trimester decreases for most women.
If you get a common cold, or have allergies, ask your pregnancy care provider what over-the-counter medications you can take. Otherwise, enjoy feeling your baby?s first kicks and movements during the second trimester, watching your baby bump grow, feeling the full burst of excitement and sense of well-being.
Your 2nd Trimester Uterus
Your uterus grows rapidly during the second trimester to make room for your baby. This shifts your center of gravity, and you may experience body aches in your back, abdomen, groin, or thighs. Stretching, changing positions more frequently, and avoiding standing for long periods may help prevent or relieve this discomfort.

You may begin to feel Braxton-Hicks contractions, also called ?practice contractions.? As your uterine muscles contract, you might feel your belly ?ball up? or feel very tight and hard. Braxton-Hicks contractions are normal, irregular, should go away within a few minutes. If your contractions become painful, come and go in waves, and don?t go away when you change positions, call your pregnancy care provide...