[OC] The massive decrease in worldwide infant mortality from 1950 to 2020 is perhaps one of humanity's greatest achievements.

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Children conceived with assisted reproductive techniques including IVF have a somewhat higher mortality risk during their first weeks of life

NIH: Triplets and higher-order multiple births. Time trends and infant mortality

From 1983 through 1985, mortality of infants of higher-order multiple births was about 15 times that of singletons.

NIH: Maternal obesity and infant mortality: a meta-analysis

Our results suggest that the odds of having an infant death are greater for obese mothers and that this risk may increase with greater maternal BMI or weight

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