The name Justine is an English baby name. In English the meaning of the name Justine is: Just; upright. Feminine of Justin. The name Justine is an American baby name. In American the meaning of the name Justine is: Just; upright.
For infanticide among animals, see Infanticide (zoology). Infanticide (or infant homicide) is the intentional killing of infants. Parental infanticide researchers have found that mothers are far more likely than fathers to be the perpetrator for neonaticide and slightly more likely to commit infanticide in general. In many past societies, certain forms of infanticide were considered permissible.
Infant - various definitions. Toddler - older. Explanation: In medicine, an infant is a child under 12 months (at least in the UK). However, in UK schools, the 'infant years' are (or used to be - the system is different now from when I was at school!) the period from ages 4 to 7. The child would then progress to junior school (often within the same school) at age 7. 'Toddler', as far as I know, has no definition in medicine and is colloquially used of a child who is big enough to walk but is still considered a baby - 'toddling' is the kind of unsteady walking associated with young children.