View Question
 Question
 Subject: Population Stats Category: Health > Children Asked by: crazyclaimer-ga List Price: \$4.50 Posted: 16 Jul 2006 18:55 PDT Expires: 15 Aug 2006 18:55 PDT Question ID: 746932
 ```I want to know the average of a Mother's first child when her second child is born. This obviously does not include any Moms who just have one child. I am also not concerned with 3rd, 4th, etc... children at this time. Please provide source of data.```
 There is no answer at this time.

 ```Mother avg age for first birth in US 2003 census is 25.2 http://www.census.gov/Press-Release/www/releases/archives/facts_for_features_special_editions/006560.html Avg age differential between 1st and 2nd born in families that ONLY have 2 children is 4. See page 44 of this study from 2004: http://www2.gsb.columbia.edu/divisions/finance/seminars/micro/fall_04/Black.pdf Would it follow then that the avg age of the mother at the birth of the 2nd child would be 25.2 + 4 = 29.2?```
 ```Thanks, however I think I may have not worded the question properly. I know the average age of a mom when she has her first child, and you are correct at 25.2 as of 2003. What I want to know is: How old is the average Mom's first born child when she has her second child? Yes, obviously you can add the 2 together to get Moms age. 4 years old is not the correct answer. I expect that it is some number between 19 months old and 35 months old, I just want to know exactly what it is. Thanks```
 ```Here is data from 2000: Average mother's age for first birth: 24.9 Average mother's age for second birth: 27.7 That would make the first born kid an average of 2.8 years (31 months). http://www.cdc.gov/nchs/data/nvsr/nvsr51/nvsr51_01.pdf Unfortunately this is mildly old data and it doesn't remove data from mothers who only have 1 child. My guess would be that mothers who have multiple children are likely to start younger than mothers with only 1 child, so if anything the average age of the first born kid would be slightly higher than the above calculation. Also, between 1994 and 2000 the average age increased about .4 years and the age has been slowly rising since the 70s. So it would not be a horrible assumption to guess that the average age from 2000 to 2006 increased about the same.```