I looked up "toddlercide" in Google and got several hits where this term is used. For example, one article lamenting abortions "Slouching from Infantcide to 'Toddlercide'" https://personalliberty.com/slouching-infanticide-toddlercide/ stated that 
"an astonishing number of college students say they support post-birth abortion — or what we commonly call murder.
These murders should take place up to ages 4 and 5, students say, because the children are not yet “self-aware.” The article did not cite a research source for the statement.

"Toddlerside" is also used by a person who is bothered by a screaming child on the other side of his apartment building: "Toddler-cide Imminent" 
http://groupthink.kinja.com/toddler-cide-imminent-1734422952

Most users of the term use it as one word--not hyphenated.