Safety of COVID-19 vaccines during pregnancy: A systematic review and meta-analysis.

The full pregnancy exposure (any trimester) to aluminum only showed a trend of a small and non-statistically significant unfavorable effect for small for gestational age outcome (aOR 1.18; 95% CI 1.00–1.39) but not in the first trimester (aOR 1.03; 95% CI 0.96–1.11) with a moderate subgroup difference by trimester of exposure (test for subgroup differences I 2 = 55%).

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