I saw you mention you didn't have the DLC yet, so here's a patch contribution if it find it helpful. It'll make it so that little kids can't do nursing jobs. Without this mod installed, this type of work cannot be done until age 10, so I just used that age for reference:

<?xml version="1.0" encoding="utf-8" ?>
<Patch>
<Operation Class="PatchOperationAdd">
<xpath>Defs/ThingDef[defName="Human"]/race/lifeStageWorkSettings</xpath>
<value>
<Nursing>10</Nursing>
</value>
</Operation>
</Patch>