Your baby is the size of a water bear.

Saguaro National Park / flickr

What's a water bear?

Only the most awesome micro-animal ever discovered

Also known as a tardigrade or a moss piglet, it's approximately 0.02 inches (0.05 centimeters) in length and lives just about everywhere and through everything you can possibly imagine.

  • Water bears can survive extreme cold absolute zero temperatures (-459°F/-273°C) and extreme heat (304°F/151°C)
  • Live in the vacuum of space (0 atm) and also comfortably in the deepest part of the Pacfiic Ocean, Mariana's trench (6,000 atm)
  • Absorb 1,000 times higher levels of radiation than other animals and not get cooked to death
  • Go 10 years without food or water

For something that is nearly indestructible, water bears are ridiculously cute.

What happens this week of pregnancy?

Read on to find out how big your baby measures, and the amazing things developing in week 3 of pregnancy.
My baby a water bear