12 Weeks Pregnant: What to Expect and Symptoms, Tips, Baby Development

12 Weeks Pregnant: What to Expect and Symptoms, Tips, Baby Development At 12 weeks, your baby is about the size of a plum and is roughly 2.1 inches long, weighing around half an ounce. During this stage, your baby is developing rapidly, and all of its organs and systems are beginning to function. Your baby’s fingers and toes are now fully separated, and their nails are beginning to form. The ears have moved into their final position on the sides of the head, and the eyes have moved closer together. Your baby’s brain is developing rapidly, and their nervous system is starting to function. Your baby’s digestive system is also starting to work, as the liver and pancreas begin to produce digestive enzymes. Additionally, the baby’s sex can now be determined through ultrasound, but you might have to wait a few more weeks for a clear picture. Changes in Your Body At 12 weeks pregnant, you may start to notice some changes in your body. Your uterus is now the size of