National Survey of Family Growth

Key Statistics from the National Survey of Family Growth - B Listing

 

Births (as reported by women)

Age at first birth

B Listing Table
2015-2017
Mean age at first birth for women 15-49 years of age who ever had a liveborn child 23.6 (0.18)

Note: Mean age calculated using age at first birth in whole years (recode variable AGEBABY1).

Source: Special tabulation by NCHS

Had a birth before age 20

B Listing Table
2015-2017
Percentage of women 15-49 who had a biological child before 20 years of age 27.3% (1.49)

Source: Special tabulation by NCHS

Number of children ever born (parity)

Percent distribution of women 15-49 and 40-49 years of age by number of children ever born using 2015-2017 NSFG:

B Listing Table
Women 15-49 Women 40-49
No children 41.9% (1.21) 14.9% (1.50)
One child 16.5% (0.80) 17.6% (1.79)
Two children 22.5% (0.88) 34.4% (2.01)
Three children 12.7% (0.73) 21.9% (2.12)
Four or more children    6.3% (0.60) 11.2% (1.61)

Source: Special tabulation by NCHS

Marital or cohabiting status of mother at time of birth

Percent distribution by marital or cohabiting status of women 15-49 years of age when their first child was born:

B Listing Table
2015-2017
Married or formerly married 53.9% (1.99)
Cohabiting 23.7% (1.42)
Unmarried and not cohabiting 22.5% (1.34)

Note: Marital or cohabiting status here refers to opposite-sex spouses or partners

Source: Special tabulation by NCHS

 

Percent distribution by marital or cohabiting status at birth for births occurring in the 5 years before interview to women 15-49 years of age:

B Listing Table
2015-2017
Married or formerly married 61.3% (2.29)
Cohabiting 26.4% (1.98)
Unmarried and not cohabiting 12.4% (1.17)

Note: Marital or cohabiting status here refers to opposite-sex spouses or partners

Source: Special tabulation by NCHS

Premarital/nonmarital status of births

B Listing Table
2015-2017
Percentage of women 15-49 years of age who ever had a birth who have ever had a nonmarital birth 49.5% (1.93)

Note: Marital status here refers to opposite-sex spouses

Source: Special tabulation by NCHS

 

Births (as reported by men)

Age at first birth he fathered

B Listing Table
2015-2017
Mean age at the birth of first biological child for men 15-49 years of age who ever fathered a biological child 26.5 (0.21)

Source: Special tabulation by NCHS

Fathered a biological child before age 20

B Listing Table
2015-2017
Percentage of men 15-49 who have ever fathered a biological child before 20 years of age 10.7% (1.00)

Source: Special tabulation by NCHS

Number of biological children ever fathered

Percent distribution of men aged 15-49 and 40-49 by number of biological children they ever fathered:

B Listing Table
Men aged 15-49 Men aged 40-49
No children 55.3% (1.48) 23.3% (1.96)
One child 15.1% (0.99) 18.4% (1.90)
Two children 16.6% (1.04) 31.8% (2.45)
Three or more children 13.0% (0.94) 26.4% (2.19)

Source: Special tabulation by NCHS

Marital or cohabiting status of father at time of birth

Percent distribution by marital or cohabiting status of men 15-49 years of age when their first biological child was born:

 

B Listing Table
2015-2017
Currently or formerly married to the child’s mother
60.1% (2.14)
Cohabiting with the child’s mother
26.1% (1.81)
Unmarried and not cohabiting with the child’s mother
13.8% (1.20)

Note: Marital or cohabiting status here refers to opposite-sex spouses or partners

Source: Special tabulation by NCHS

 

Birth expectations among women and men

Average number of children expected by women and men in their lifetimes

B Listing Tables
2015-2017
Women
Men
Average number of children
expected
2.2 (0.05)
2.1 (0.06)

Source: Special tabulation by NCHS

 

Percent distribution of women and men 15-49 years of age by expected number of births in their lifetimes

B Listing Tables
2015-2017
Percentage who expect:                      
Women
Men
No births
10.9% (0.68)
14.2% (0.81)
1 birth
14.2% (0.83)
14.7% (0.91)
2 births
38.1% (0.95)
38.9% (1.24)
3 births
24.7% (0.95)
20.5% (0.92)
4 or more births
12.1% (1.29)
10.7% (1.45)

Source: Special tabulation by NCHS

Breastfeeding

Initiation of breastfeeding

B Listing Table
Singleton babies born
2014-2016
Percentage of babies who were breastfed at all
82.9% (1.90)

Note: These births occurred in 2014-2016 to mothers aged 15-49 at time of interview in 2015-2017.

Source: Special tabulation by NCHS

Duration of breastfeeding

B Listing Table
Singleton babies born
2014-2016
Percentage of babies who were breastfed 3 months
or more
82.9% (1.90)

Note: These births occurred in 2014-2016 to mothers aged 15-49 at time of interview in 2015-2017.

Source: Special tabulation by NCHS

Page last reviewed: November 6, 2019