Preterm birth
James Elgin Gill (born on 20 May 1987 in Ottawa, Ontario, Canada) was the earliest premature baby in the world, until that record was broken in 2014. He was 128 days premature (21 weeks and 5 days' gestation) and weighed . He survived.
Infanticide in primates
Maternal Infanticide, the killing of dependent young by the mother, is rare in non-human primates and has been reported only a handful of times. Maternal infanticide has been reported once in brown mantled tamarins, "Saguinus fuscicollis," once in black fronted titis, "Callicebus nigrifrons," and four times in mustached tamarins, "Saguinus mystax". It is proposed that maternal infanticide occurs when the mother assesses the probability for infant survival based on previous infant deaths. If it is unlikely that the infant will survive, infanticide may occur. This may allow the mother to invest more in her current offspring or future offspring, leading to a greater net reproductive fitness in the mother.