My Baby - Week by Week Pregnancy
Week 25 - Ossification
Your baby weighs about 1.5 pounds and measures 13.5 inches from head to heel. He or she is becoming stronger as its stem cells continue to develop into bone tissue, and its bones become solid through a process called ossification. Your baby is also gaining more fat to help him or her regulate body temperature after birth (and give him those adorable baby rolls) and pigment is developing in his skin.
Learn More: Ossification
How is your body changing this week? Find out: My Pregnant Body Week 25
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