Iron Supplementation at 1 mg/kg/Day for Exclusively Breastfed Full-Term Infants: A Meta-Analysis

Area of Science:

• Pediatrics
• Nutritional Science
• Hematology

Background:

• Iron deficiency is a prevalent concern in exclusively breastfed infants.
• Early iron supplementation is often recommended to prevent anemia.
• Optimal dosing and duration for iron supplementation remain under investigation.

Purpose of the Study:

• To evaluate the impact of 1 mg/kg/day iron supplementation on hematologic and growth parameters in exclusively breastfed, full-term infants.
• To synthesize evidence from randomized controlled trials (RCTs) on iron supplementation efficacy.
• To identify factors influencing the effectiveness of iron supplementation.

Main Methods:

• Meta-analysis of seven RCTs involving 1114 infants.
• Comparison of iron supplementation versus placebo or no intervention.
• Primary outcomes included hemoglobin (Hb), serum ferritin (SF), mean corpuscular volume (MCV), height, and weight.

Main Results:

• Short-term iron supplementation (4-6 months) significantly increased Hb levels (MD = 6.29 g/L, p = 0.01).
• Serum ferritin levels were significantly increased at 12 months (MD = 5.95 μg/L, p = 0.04) but not at 6 months.
• No significant differences were observed in MCV, height, or weight; effects diminished with longer supplementation duration.

Conclusions:

• While short-term iron supplementation can improve iron status in infants, the benefits may not be sustained.
• The lack of long-term effects suggests that universal iron supplementation might not be optimal for well-nourished populations.
• Individualized approaches to iron supplementation may be preferable, considering factors like formulation and region.