Crossword Genius

Hospital where chubby, second baby is delivered (7)

Ross

I believe the answer is:

rotunda

I'm a little stuck... Click here to teach me more about this clue!

'hospital' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I don't see?

'chubby second baby is delivered' is the wordplay.
I cannot really understand how this works, but
'chubby' could be 'rotund' (I've seen this in another clue) and 'rotund' is found within the answer.
'second baby' could be 'a' (2nd letter of 'baby') and 'a' is present in the answer.
This accounts for all the letters.
This explanation may well be incorrect...

'where' acts as a link.

Can you help me to learn more?

(Other definitions for rotunda that I've seen before include "Italian Pantheon, for instance" , "Circular room or building" , "circular construction" , "Round building or hall" , "domed hall" .)

I've seen this clue in The Irish Times.
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