Which of the following is NOT a sign of sexual maturity in girls? 

The correct answer is 1) Cracking of voice.

Key Points

• Cracking of voice is typically associated with puberty in boys, not girls.
• During puberty, boys experience a deepening of the voice due to the growth of the larynx and lengthening of the vocal cords.
• Girls do not usually experience a significant change in voice pitch during puberty.
• The voice changes in girls during puberty are generally more subtle and less pronounced compared to boys.

Additional Information

• Oily Skin: An increase in the production of sebum due to hormonal changes often leads to oily skin during puberty in both boys and girls.
• Increase in Breast Size: One of the primary signs of sexual maturity in girls is the development and growth of breasts.
• Menstruation: The onset of menstruation is a key indicator of sexual maturity in girls, marking the beginning of reproductive capability.
• Puberty in Girls: Typically occurs between the ages of 8 and 13 and includes physical changes such as the development of secondary sexual characteristics and the onset of menstruation.
• Hormonal Changes: Puberty is driven by hormonal changes, primarily the increase in estrogen in girls, which leads to the development of secondary sexual characteristics.