Table 1

Nutritional phases in Prader Willi syndrome

0PrenatalReduced fetal movements and lower birth weight than sibs
1a0–9 monthsHypotonia with difficulty feeding and decreased appetite
1b9–25 monthsImproved feeding and appetite, growing appropriately
2a2.1–4.5 yearsWeight increasing without appetite increase or excess calories
2b4.5–8 yearsIncreased appetite and calories, but can feel full
38 years to adulthoodHyperphagic, rarely feels full
4AdulthoodAppetite is no longer insatiable
  • From Miller et al7, Butler et al.8