Practising tiny breaths.
About the size of an ear of corn — or a ferret, or an ice-cream cone. 30 cm (11.8 in), 600 g (1 lb 5 oz).
What's happening this week. The face is almost fully formed, with tiny eyelashes and eyebrows in place. The inner ear is developed enough to give a sense of balance.
Face nearly fully formed. Inner ear controls balance. Lungs building surfactant.
Surfactant is the slippery coating that stops the tiny air sacs in the lungs sticking shut — they start making it about now.
What your partner can do this week: Put your leave dates in, and check them with work. Take over one evening routine completely, so your partner can rest. Book an antenatal class if you haven't yet.