Table 1 Data of medical history (n = 913)

Gestational age, weeks

39.1 (1.8)

Start of colic symptoms, age in weeks

1.6 (1.2)

Bodyweight, kg

   at birth

3.45 (0.55)

   at start of the study

4.58 (0.77)

Length, cm

   at birth

50.1 (2.4)

   at start of the study

55.4 (2.8)

Prevalence of colic symptoms as infant

   Mother

298 (33%)

Yes

515 (57%)

No

93 (10%)

Don't know

235 (26%)

Father

501 (55%)

Yes

168 (19%)

No

Don't know

Colic symptoms in 593 biological siblings

348 (59%)