Name for a child born to older parents long after its siblings

[bibliotaphist]

Is there a general term used in English for a sole last child in a family, born to older parents, long after its siblings were born? It seems to be a common phenomenon in large Victorian families, and you'd think there would be a name for it.

Google has thrown up terms in other languages - Afrikaans laat lammetjie ('late lamb'), Norwegian attpåklatt ('afterthought') - and, I'm guessing recent, American English slang caboose baby, but has anyone come across any other term?

[Beavances]

.an afterthought?

[rosie99]

    

or often a grandchild taken on as supposedly there own - Adopted

[avm228]

I’ve heard “late lamb” in English too.

[bibliotaphist]

   

or often a grandchild taken on as supposedly there own - Adopted

Yes that did occur to me!

[heywood]

Accident/afterthought/change of life baby - they don’t sound quite as tender as late lamb.

[stanmapstone]

Sometimes the presence of an unmarried daughter of child-bearing age in the household will raise the suspicion that the infant 'sons' and 'daughters' of elderly parents might be illegitimate grandchildren.

Stan

[brigidmac]

Miracle baby ....said by parents who've spent years trying to conceive
I like late lamb expression

[heywood]

That’s lovely brigidmac.