Captain Tom Nystrom, of Finnair, gave a helping hand after he saw that an overwhelmed mother had four young boys, two of which were babies needing a feed.
He offered to hold one of the babies on his lap and feed him the bottle.
"I have children of my own... so it came natural to me to help this customer with her babies," Mr Nystrom told Inside Edition.
When one child became fussy, he would hand the boy back to his mother and take another child instead.
A flight attendant on the plane, Ami Niemela, explained on Instagram how the rest of the crew also offered to pitch in.
"Naturally, one cannot travel with two babies on one's lap," she wrote on Instagram.
"So we had to solve the dilemma of [a] missing lap, otherwise it would have been a no-go for mom and the kids.
"Luckily we had our positioning crew on board and wonderful Tom took the task of being the extra lap."
When she was at the Helsinki-Vantaa Airport, she shared a photo on the social media site of the baby and the smiling pilot.
The photo has been liked more than 1,000 times.
"Having strangers show you this kind of kindness during this stressful time means more than anyone can know," said one Instagram user.
"Acts of kindness, priceless," said another.
The airline was quick to jump on the positive publicity, tweeting the photo and an accompanying news story.
"Kudos to our purser @finami & pilot Tom! Story about a pilot looking after a baby is simply adorable," Finnair tweeted from its official account.
Ms Niemelä also gained attention when she posted a video of her colleagues singing to passengers and handing out chocolates aboard another flight.
The airline was awarded Best European Airline at the TTG China Travel Awards for the second consecutive year last month.
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