A study in contrasts. Or - Be careful what you wish for.

Dale, at 1 year old -

Terrified of any toy that makes noise. Music, sound-effects, anything that has batteries. Terrified.

Alan, at 1 year old -

Enjoys surrounding himself with as many light-up, music-playing, noise-making toys he can find and pushing all the buttons that make them all play. All at once.

The word cacophony comes to mind.

As well as the word headache.