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As you complete 13 weeks of pregnancy, the baby’s head is already developed. The rest of the body will slowly catch up. Don’t be surprised if you find your baby is sucking their thumb in the ultrasound. Your body is going to go through some amazing changes in that time. Your breasts will grow in size as they fill up with raw milk that is going to be your baby’s first food. It is time to be happy, as most uncomfortable symptoms will pass.