The star has no regrets, however.
Hilaria says she has cast off the taboo of talking about early pregnancy.
"I understand how overwhelming it is to be a new parent."
The singer has two young girls with his supermodel wife, Behati Prinsloo.
The star also posted a throwback photo of the minute she discovered she was pregnant with baby Gene.
"First Carji with a bump on board," the glowing mum wrote.
The planet is enjoying the jokes between the two celebrity mummas.
The star has been applauded for normalising breastfeeding.
Baby Reid entered the world ahead of the AFL Grand Final this weekend.
"He thinks he's Spider Man now, so we're safe from crime."
'I'm glad I had a career before having a baby.'