Nail growth rates increase dramatically during _____.

• A. Adolescent
• B. Winter
• C. Infancy
• D. Last trimester of pregnancy

Answer: (D)

Nail growth rate is driven by activity in the nail matrix and is strongly influenced by hormones and circulation. In the last trimester of pregnancy, the body undergoes hormonal shifts and a significant increase in blood volume and circulation to support the fetus. These changes boost the delivery of nutrients and oxygen to the nail matrix, accelerating keratin production and pushing the nail forward faster. That combination makes nails appear to grow more rapidly during late pregnancy. While adolescence or infancy involve growth spurts, the pronounced, pregnancy-related boost in the final months is the factor most likely to cause a dramatic increase. Seasonal factors like winter can slow growth due to dryness and reduced circulation.