Many healthy babies have some jaundice during the first week of life. It usually goes away. However, jaundice can happen at any age and may be a sign of a problem.
Starts Monday or Sunday. According to international standard ISO 8601, Monday is the first day of the week. It is followed by Tuesday, Wednesday, Thursday, Friday, and Saturday. Sunday is the 7th and final day.
First week of October means, the days starting from 1st of October till the firstSunday of October. ... It simply means  the first seven days of a month which is considered as the first week ( inspite the monthstarting from any day) and so on.