My mom and dad had 15 babies in 17 years. That makes most of us 1 year apart. There is 4 years between my brother and myself, because in the 4 years, 2 babies were born, but they both died of SIDS.
mom and dad married in June 1955:
had babies in:
April 1956
April 1957
May 1958
1959(deceased, born premature)
May 1960
June 1961
July 1962
Oct 1963
Oct 1964(deceased Jan. 1965, SIDS)
Feb 1966(deceased May 1966, SIDS)
Jan 1968 (ME)
April 1969
July 1970
Aug 1971
July 1973