Ears work now — talk and sing to the bump.
About the size of an avocado — or a budgie, or a cupcake. 11.6 cm (4.6 in), 100 g (4 oz).
What's happening this week. The ears work now — your voices reach the baby through the water. The eyes make small movements behind closed lids, and the heart pumps impressively hard.
Hearing is switching on. Eyes move behind closed lids. Muscles are getting stronger.
Talk and sing to the bump — from about now, the baby is genuinely listening.
What your partner can do this week: Start talking or reading to the bump — a small ritual you can both keep up. Put the next check-up on the shared calendar, with your questions attached. If you've chosen an antenatal class, book it.