These kind of acts are getting more popular worldwide. It's a known and popular thing in countries like Turkey. Here if a mother works outside of the house (before not many did but woman employement  is on a big rise), she can let her parents or in-laws to take care of the baby until she is back home.

Moreover, it's getting institutionalised in countries like Japan. Here's a story about this: https://www.japantimes.co.jp/news/2013/09/05/national/babies-comfort-the-elderly-and-moms-benefit-as-well/#.Wd8qlhO0OT8

I can say it's trending throughout the whole world because of increasing women employment. I hope this is beneficiary for anyone interested in the subject. Have a nice day :)