1. Tim and Rachel come to congratulate Alec on his new big brother status (and to admire Bettany).
2. To put out all the cakes -- a cake-stand should always be crowded.
3. Bettany busts her nappy. It drips off Nick's trouser and makes a puddle on the floor that flows out until it reaches his slipper. Then nosey Alec puts his hand in it: 'What dat?'. The only good thing about this sort of thing is that an escalating crisis makes a better story.