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Months mother was pregnant when delivered

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For sample persons less than 18 in 1988, and sample persons less than 6 years old whose biological mothers is the respondent in 1981, PGMOSBIRTH reports how many months pregnant the person's biological mother was when the person was born.

This variable is part of the 1981 and 1988 Child Health Supplement. Please use the IPUMS NHIS drop-down menus and search function to find other variables related to this supplement.


The 1981 and 1988 Child Health Supplement collected information about children 17 years of age and younger on a wide range of topics, including: family structure, child care, breastfeeding, development, medications, birth and prenatal events, hospitalizations and surgery, chronic conditions, weight, school, behavior problems, social issues, and sleep habits. All questions were asked of the adult best able to provide accurate information about the child. The preferred respondents for this supplement, in order of priority, are: biological mother, biological father, an adoptive, step, or foster parent, a legal guardian, a primary caretaker, or another adult.


There are no comparability issues with this variable.


  • 1981: Sample persons under age 6, whose respondent is biological mother.
  • 1988: Sample persons under age 18.


  • 1981, 1988