[Dr.Vad]

Все больше и больше публикаций, где уже с 8-9 мес. возраста анемией считается гемоглобин менее 110 г/л, а не с 12 мес. возраста:

The present study examined healthy Korean infants (8–15 months old) and their caregivers who visited our clinic for health examinations and ID screening between 2012 and 2015.
Cases of ID were defined as infants with 1) serum ferritin levels of < 12 ng/mL or 2) MCV of < 70 fL and transferrin saturation of < 10% (1,27,28). The non-ID group was defined as infants who did not fulfill the ID criteria. Anemia was defined as hemoglobin levels of < 11 g/dL, and IDA was diagnosed based on the coexistence of ID and anemia.

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здесь вообще с 6 мес.

Iron Nutriture of the Fetus, Neonate, Infant, and Child
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С Медскейпа: минус 2СО менее 95 перцентилей или уже анемия

The reference ranges for hemoglobin concentration in children are as follows: [Гематология Хофманна 2009]

Birth: mean 16.5 g/dL (-2SD: 13.5 g/dL)
1-3 days: mean 18.5 g/dL (-2SD: 14.5 g/dL)
1 week: mean 17.5 g/dL (-2SD: 13.5 g/dL)
2 weeks: mean 16.5 g/dL (-2SD: 12.5 g/dL)
1 month: mean 14.0 g/dL (-2SD: 10.0 g/dL)
2 months: mean 11.5 g/dL (-2SD: 9.0 g/dL)
3-6 months: mean 11.5 g/dL (-2SD: 9.5 g/dL)
0.5-2 years: mean 12.0 g/dL (-2SD: 11.0 g/dL)
2-6 years: mean 12.5 g/dL (-2SD: 11.5 g/dL)
6-12 years: mean 13.5 g/dL (-2SD: 11.5 g/dL)
12-18 years female: mean 14.0 g/dL (-2SD: 12.0 g/dL)
12-18 years male: mean 14.5 g/dL (-2SD: 13.0 g/dL)