Prader-Willi syndrome can shift from feeding difficulty to relentless hunger in childhood

Early signs can include weak muscle tone and feeding problems in babies, while older children may develop intense food-seeking behaviour, highlighting the importance of prompt diagnosis and multidisciplinary support.

Prader-Willi syndrome is a rare genetic disorder that can affect feeding, growth, movement and behaviour at different stages of childhood. According to the Mayo Clinic and the US National Institute of Child Health and Human Development, the condition is usually suspected because of its symptoms and then confirmed with genetic testing. Early recognition matters because treatment and support can begin sooner, often through a multidisciplinary team that may include doctors, dietitians, therapists and behaviour specialists.

In the earliest weeks of life, the most common clues are very low muscle tone, weak sucking and trouble feeding. MedlinePlus and the Mayo Clinic say babies may seem unusually sleepy, have a weak cry and struggle to take in enough milk, which can slow weight gain and early development. Some infants need special feeding equipment or tube feeding under medical supervision to meet their nutritional needs.

As children grow, the picture often changes. The condition is known for hyperphagia, an intense and persistent drive to eat, which can make food-seeking behaviour difficult to manage and raise the risk of obesity. The Eunice Kennedy Shriver National Institute of Child Health and Human Development says the disorder can also be linked with short stature, delayed motor skills, learning difficulties and behavioural challenges such as temper outbursts, compulsive habits and skin picking.

The exact cause is believed to involve the hypothalamus, the part of the brain that helps regulate hunger, sleep, temperature and hormones, according to the NICHD. Treatment is tailored to symptoms, but commonly includes careful food supervision, structured exercise, growth hormone therapy and, when needed, hormone replacement. Early intervention can also support speech, movement and behaviour, giving children a better chance of making progress over time.