child from the ICE train

A young architect is on his way to work by train, reading the newspaper and pondering his thoughts. A woman with a headscarf takes a seat in the compartment, carrying a large carrier bag. When she leaves the compartment a short time later, the bag is still there. Beat hears a soft whimper and curiously takes a look at the mysterious bag: it contains a baby, no more than a week old. Beat and his wife have already tried everything to have a child. Their desire to have a child is strong, they are wealthy and could offer a child a lot, but it just won't work out with a pregnancy. This child needs a mother, his mother. What should he do?