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The shape of your bottom cannot tell you anything about your hormones, whatever recent social media posts claim. Determining hormone levels requires appropriate laboratory testing; buttock shape is not a reliable indicator.

A heart-shaped bottom, influencers say, signals healthy estrogen, while an H shape means too much cortisol. In reality, buttock shape doesn't reflect your circulating hormone levels from day to day, week to week or month to month.

So what decides your shape? Mostly your genes. They give you your skeletal structure and your muscle size and structure. They also determine how much fat you are likely to carry in the buttocks and everywhere else.

The shape of the pelvis varies between people. In obstetrics, four traditional categories describe the internal bony structure of the pelvis, which is also the shape of the opening through which a baby passes during birth: gynecoid, android, anthropoid and platypelloid.

Gynecoid is the most common in females and the most favorable for a vaginal birth. Android is narrower and close to the shape of a male pelvis. Anthropoid is narrower from side to side but longer from front to back, while platypelloid is the reverse. You cannot tell which type a woman has by looking at the skin over her pelvis or buttocks.

This bony framework is what your muscles attach to. It also decides the spaces around them that get filled in with fat .

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