You are in the last week of the second trimester. Your baby is not the only one going through a growth spurt, you are too. You'll put on an average of 400-500 grams a week. That won't matter; in fact it's normal. Your body is building up reserves for the baby. Nothing to worry about as long as you continue to eat a healthy diet. You'll lose the extra pounds again once you've given birth.
You might have been full of energy before but you'll notice that your energy levels will drop again from now on. You may start to feel very tired again, as you did in the early stages of pregnancy. You'll also want to be alone more (or with your partner) and want peace and quiet and rest.
Your baby is gaining weight but will not grow much more in length. He already has eyebrows and eyelashes and his eardrums are developing now. His eyes are a bluish slate grey. The eye colour will usually change, often more than once, and it can take up to a year for the final shade to settle.
Unborn babies often get hiccups. You could feel this more and more often from now.
Your body is preparing for the birth. Hormones will cause the ligaments to stretch and the cartilage to soften. This will create more space in your pelvis, enabling your baby to be born naturally. If the ligaments become too loose however, walking can be painful. This is called pelvic instability. It is quite common in pregnant women and if you are going to develop this, it will likely start at this stage.
If this is not your first pregnancy and you did suffer from pelvic instability last time, a physiotherapist or pelvic therapist could help you with some exercises. This could help prevent as many problems as possible.
Heartburn is another common complaint during pregnancy. The mass of hormones in your body have a relaxing effect on the valve between your throat and stomach, which enables acidic gastric juices to escape up into your throat. This is what causes heartburn during early pregnancy.
When you're around 7 months pregnant, your uterus places quite a pressure on your stomach, pushing the acidic gastric juices upwards.
Changing your eating habits may help e.g. by eating smaller portions more frequently. Try to avoid spicy food. Citrus fruits can also lead to more acid. A lot of women find eating custard or drinking hot milk helps ease the symptoms.
If none of this works, there are medicines available that won't harm the baby. Ask your midwife for advice.