Among Vietnamese families, and among foreigners other than Japanese, I at least rarely see a household where a single adult brings a small child to the hospital alone.
In Vietnamese families, it is often the woman who brings the child, but she is not alone. A parent, a relative or the father comes along. Foreigners other than Japanese cannot rely on relatives, but they usually bring their child as a couple. Since it is a weekday, in many cases they have taken time off work to have their child seen by a doctor.
Only the Japanese are different. While coughing themselves, they make full use of baby carriers, holding one baby on the back and another on the chest, and lead a kindergartner by the hand with the other hand. Whether they are exhausted or unwell makes no difference. They sit in the hospital alone, keeping an eye on several small children. And in most cases, that person is a woman.
In this sense, the Japanese are the only ones who use baby carriers. Everyone else has several people looking after one infant, so they have no need for one.
→ Read the full article (note): Why Japanese "Moms" Have No Choice but to Use Baby Carriers