You are 16 weeks and 2 days

Your baby is at his most mobile around now, and may even be doing somersaults in your uterus.

166 days until your due date

Your baby can now move in several ways: he can curl and stretch his body, move his head up and down and side to side, and move his arms and legs independently. He makes regular breathing movements with his chest and occasionally hiccups. He can open and shut his mouth, yawn, and swallow amniotic fluid. He brings his hands up to his face and prefers lying on his side to his back, and he has plenty of room to move.

Your baby's taste buds first appeared at 10 weeks and now look very like mature taste buds. They have their own nerve supply from a branch of the facial nerve, but because these connections haven't matured, it's too early for him to taste anything.

Focus on

Twins: How your babies interact

You may be starting to feel your twins move. They probably started touching each other weeks ago, and their contact becomes more complex as their brains develop. By now, each baby has the basic brain circuits to feel parts of its body and sense their position, so it's no wonder they can interact at a basic level.

Your babies move around 50 times an hour and can touch each other, even though in all but a tiny percentage of cases they're in separate amniotic sacs with a membrane between them. Ultrasound studies show twins make physical contact and sometimes react to each other's touch and pressure.

Ask a Doctor

What is DVT, and am I more at risk when I fly?

DVT (deep vein thrombosis) is a blood clot in a deep leg vein that partly or fully blocks blood flow, causing pain and discomfort. The most serious form is a pulmonary embolism, when part of the clot breaks off and blocks an artery in the lungs, causing chest pain, breathlessness, and coughing up blood-tinged phlegm. In severe cases it can be fatal.

Pregnancy makes blood clots more likely, so you're at higher risk of DVT even when not flying. Women who've had DVT before or who are obese are at greater risk.

Support stockings, plenty of fluids, and moving around on the plane help prevent DVT. If you've had clotting problems in the past, don't fly at all during pregnancy.

This is general information based on NHS guidance, not medical advice, and every pregnancy is different. Talk to your midwife or GP about anything that worries you. If your baby's movements slow down or change, or you have bleeding, severe pain or leaking fluid, call your maternity unit straight away. In an emergency, call 999.