shabbat - The custom of adding a candle for each child

Many people, including myself, added or will add a candle on Friday night for each child that is born. Where and when did this custom originate?

Answer

The oldest source I could find is the Likutei MaHarich - (c. 1900). I recall hearing that the custom started, since the Halacha is that if the lady forgot to light one week she has to add a candle in future weeks, often when a lady gave birth they were busy and forgot. (Childbirth was not as easy years ago). Due to this they added a candle and today it has become a common Minhag.