Yes. The changes in hormones in a woman's body cause her body shape to change as she ages. The most significant changes occur throughout adolescence. Young males and females have nearly identical hip-waist ratios, but oestrogen causes a female's hips and breasts to grow with time. With ageing, oestrogen causes fat to accumulate in the thighs and hip regions. Pregnancy raises oestrogen levels, resulting in increased weight gain in females.