Re: When did you introduce a pillow?
Whenever they move to a toddler bed (or big bed). For DD that was at like 14 months and with DS it was at 2 1/2. They don't really seem to care about a pillow so I don't worry about one until they switch beds.
The only time you should look in your neighbor's bowl is to make sure that they have enough. You don't look in your neighbor's bowl to see if you have as much as them.