Sometimes the baby will fall asleep to the music, if you get one that plays music
They stimulate baby
.. Babies love movement and color
They're definitely not a necessity. I think it's just for baby's entertainment. Not really just looks but still .. honestly a baby can go without a crib mobile
A mobile came with the bedding I bought. It's so loud and annoying lol. We haven't used it once and she's a month old. I don't plan on using it.
It distracts them so they don't yell to be in your arms. My son loved his at night because it played music and I put glowing stars on it.
Ahhh I will try to find one :) its hard to find one I like though lol
Yeah I'm picky too. But once you pick one out you can buy glow in the dark fabric paint and put stars or hearts on it. My son just loved the floating stars at night they were teddy bears in the morning though