The following shows the number of children which Japanese married couples (have been married for more than 15 years) have. The average number of children is decreasing recently.
56.2 % couples have two kids.
| Year, survey conducted | Number of samples | None | One | Two | Three | Four or more |
| 1977 | 1,427 | 3.0 | 11.0 | 57.0 | 23.8 | 5.1 |
| 1982 | 1,429 | 3.1 | 9.1 | 55.4 | 27.4 | 5.0 |
| 1987 | 1,755 | 2.7 | 9.6 | 57.8 | 25.9 | 3.9 |
| 1992 | 1,849 | 3.1 | 9.3 | 56.4 | 26.5 | 4.8 |
| 1997 | 1,334 | 3.7 | 9.8 | 53.6 | 27.9 | 5.0 |
| 2002 | 1,257 | 3.4 | 8.9 | 53.2 | 30.2 | 4.2 |
| 2005 | 1,078 | 5.6 | 11.7 | 56.0 | 22.4 | 4.3 |
| 2010 | 1,385 | 6.4 | 15.9 | 56.2 | 19.4 | 2.2 |
Source is National Institute of Population and Social Security Research. Title 第 14 回出生動向基本調査 表２-２ 調査別にみた、出生子ども数分布の推移(結婚持続期間 15～19 年)
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