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Table 1 Nutritional phases in Prader-Willi Syndrome[6]

From: Endocrine manifestations and management of Prader-Willi syndrome

Phase Description Median Age of Onset and Completion
0 Decreased fetal movement and lower birth weight In utero
1a Hypotonia with difficulty feeding 0-9 months
1b No difficulty feeding and growing appropriately 9-25 months
2a Weight increasing without increase in appetite or excessive calories 2.1-4.5 years
2b Weight increasing with an increase in appetite 4.5-8 years
3 Hyperphagic, rarely feels full 8 years - adulthood
4 Appetite no longer insatiable adulthood