Outcome or subgroup	Studies	Participants	Statistical method	Effect estimate
11.All‐cause neonatal mortality	6	126548	Risk ratio (IV, Random, 95% CI)	0.99 [0.90, 1.08]
12.All‐cause infant mortality at 6 months	12	154940	Risk ratio (IV, Random, 95% CI)	0.98 [0.89, 1.07]
13.All‐cause infant mortality at 12 months	8	118376	Risk ratio (IV, Random, 95% CI)	1.04 [0.94, 1.14]
14.Adverse events: bulging fontanelle	6	100256	Risk ratio (IV, Random, 95% CI)	1.53 [1.12, 2.09]
15.Adverse events: vomiting	5	99582	Risk ratio (IV, Random, 95% CI)	1.00 [0.93, 1.07]
16.All‐cause neonatal mortality: sensitivity analysis: fixed effect model	5	126242	Risk ratio (IV, Fixed, 95% CI)	0.99 [0.90, 1.08]
17.All‐cause infant mortality at 6 months: sensitivity analysis: fixed effect model	12	154940	Risk ratio (IV, Fixed, 95% CI)	0.97 [0.91, 1.03]
18.All‐cause infant mortality at 12 months: sensitivity analysis: fixed effect model	8	118376	Risk ratio (IV, Fixed, 95% CI)	1.02 [0.96, 1.08]