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Mother's choice to provide breast milk and developmental outcome.

We do not know what proportion of our patients were scanned in the third trimester, but during 1985-7 the mean number of ultrasound examinations per booked pregnancy was 2-7. In contrast to Gunn et al, six out of 15 cases of definite pathology detected to date were first suspected between 15 and 19 weeks' gestation. We agree with them, however, that in addition to a routine scan at about 18 weeks, every fetus should ideally have a further ultrasound examination after 28 weeks' gestation.