Table 1

 Characteristics of healthy, breast-fed reference infants

CharacteristicsHealthy, breast-fed infants (n = 1544)
Data are means (SD) or percentages.
Maternal age in years30 (4.7)
Girls (%)49
Gestation in weeks (n = 1543)39.5 (1.4)
Preterm <37 weeks (%)2.0
Parity (%)
    First45
    Second36
    Third or more19
Delivery (%)
    Spontaneous80
    Caesarean section10
    By vacuum extraction or forceps10
Birth weight in kg3.44 (0.46)