Week 25: your baby is the size of a colugo

Your fetus is now about the length of a colugo, or Sunda flying lemur, a cat-sized gliding mammal from the forests of Southeast Asia with a body around 34 to 38 cm. Despite the name it is neither a lemur nor capable of true flight, and biologists find it so distinctive it sits in its own tiny order.

What it does have is the most complete gliding membrane of any mammal. Its gliding membrane stretches from neck to fingertips to toes to tail, even webbing between its fingers, so it can sail more than 100 metres between trees while barely losing height.

A mother glides with her baby clinging to her belly, the membrane doubling as a hammock, so the young essentially travels the treetops in a built-in sling.

Meanwhile, inside you

Your fetus this week is developing more fat and their skin is becoming less translucent. Their hair is starting to have color, and their hands are now fully formed with prints on the fingertips.