Hi mumsnet - a sneaky namechanger here, of course.
Accidentally overheard this said about someone today.
The context is that someone said that XXX is on leave today due to something to do with her children - and the reply was the subject line.
Not a native speaker, so not completely sure of the implied meaning here. If I directly translate it to my own language, it sounds quite rude, with a hint of "I can't believe someone decided to reproduce with her", unless, of course, when about a very young woman. Not the case here, as it was said about a woman in her late 30s.