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Doctors have uncovered the first evidence that fathers of test-tube babies may be passing on their infertility to their sons.

A new study has found that boys conceived through IVF treatment involving a single sperm being directly injected into a female egg often inherit shorter fingers, a trait known to be associated with infertility.

The results raise the prospect of a new and growing generation who may be less likely to have children of their own.

There are now an estimated 1m children across Europe born through IVF treatment.

Almost one in 50 British babies is conceived artificially and nearly half the couples having treatment go through a procedure known as ICSI (intracytoplasmic sperm injection).

The technique bypasses the normal competition where only the healthiest sperm cell is able to reach the female egg and fertilise it.

Alastair Sutcliffe, a paediatrician at the Institute of Child Health in London, led the Anglo-German study which compared 211 six-year-olds conceived through ICSI with 195 naturally conceived children of the same age.

The ICSI group were similar heights to the naturally conceived group...