He very kindly shows her how to carry a baby.

ALICE, with becoming humility, 'Thank you, Cosmo.'

He does not observe the gleam in her eye, and is in the high good
humour that comes to any man when any woman asks him to show her how
to do anything.

COSMO. 'If you like I'll show you with a cushion. You see this'--scoops
it up--'is wrong; but this'--he does a little sleight of hand--'is
right. Another way is this, with their head hanging over your shoulder,
and you holding on firmly to their legs. You wouldn't think it was
comfortable, but they like it.'

ALICE, adoring him. 'I see, Cosmo.' She practises diligently with the
cushion. 'First this way--then this.'

COSMO. 'That's first-class. It's just a knack. You'll soon pick it
up.'

ALICE, practising on him instead of the cushion, 'You darling boy!'

COSMO. 'I think I hear a boy calling the evening papers.'

ALICE, clinging to him, 'Don't go. There can be nothing in the evening
papers about what my boy thinks of his mother.'

COSMO. 'Good lord, no.' He thinks quickly. 'You haven't seen Amy yet.
It isn't fair of Amy. She should have been here to take some of it off