23 weeks

HOW YOUR BABY IS GROWING AT 23 WEEKS:
Your baby is more than 11 inches long and weighs just over a pound (about as much as a large mango). Her skin is red and wrinkled. Blood vessels in her lungs are developing to prepare her for breathing. She can swallow, but she normally won't pass her first stool (called meconium) until after birth. Loud noises heard often in utero — such as your dog barking or the roar of a vacuum cleaner — probably won't faze your baby when she hears them outside the womb.

(...good because I plan to keep Etta and the vacuum around for a long time.)