Table 1.

Nominal age, allowable age ranges, and feeding regimens determining eligibility, 2004–2005.

		Feeding regimens
Nominal age	Allowable age ranges (days)	Breast milka	Cow milk formulaa	Soy formula
< 48 hr	age < 2	Breast milk exclusively	Cow milk formula exclusively	Soy formula exclusively
1 week	2 < age ≤10	Breast milk exclusively	Cow milk formula exclusively	Soy formula exclusively
2 weeks	10 ≤age ≤17	Breast milk exclusively	Cow milk formula exclusively	Soy formula exclusively
3 weeks	17 ≤age ≤24	Breast milk exclusively	Cow milk formula exclusively (hospital nursery exception)b	Soy formula exclusively (hospital nursery exception)b
1 month	24 ≤age ≤42	Breast milk exclusively	Cow milk formula exclusively (hospital nursery exception)b	Soy formula exclusively (hospital nursery exception)b
3 months	70 ≤age ≤98	Breast milk exclusively or with cow-milk supplementation	Cow milk formula exclusively (hospital nursery exception)b	Soy formulac (hospital nursery exception)b
6 months	154 < age ≤182	Breast milk exclusively or with cow-milk supplementation	Cow milk formula exclusively (hospital nursery exception)b	Soy formulac (hospital nursery exception)b

^aRestriction: Breast milk and cow milk regimens prohibit any soy foods in baby’s lifetime.

^bHospital nursery exception: Cow milk regimen allowed breast milk, and soy formula regimen allowed breast milk or cow milk while baby was in the hospital nursery immediately after birth. Exclusive feeding of ultimate regimen was required for at least 2 weeks before study examination.

^cSoy formula exception: For older children, soy formula regimen must have been fed exclusively and continuously for at least two-thirds of the child’s lifetime, including the 2 weeks before study examination.