Baby highchairs are not necessary for your child if s/he is under six months of age. Although some companies make them so they recline for infants, they are not necessary until your child is able to sit up. The choice is yours.
Highchairs currently come with all kinds of features that are really more for the parent or caregiver than the child. Although the nicely padded seat covers make the seats comfortable. Some highchairs have wheels to make them easier to move however this is not necessary. Some are now coming with height adjustable mechanisms to accommodate your childs growth and to be able bring the baby closer to the table. There are also adjustable foot rests to accommodate your childs growth as well. Most now fold for easy storage.
Highchairs now can be converted into play tables. Some of them have an insert that fits over the tray to give you baby a place to play. The feeding tray on many models come with an inset cup/bottle holder and some models have extra large feeding trays.
The base of the highchair should be broad and stable to help prevent the highchair from tipping. If your child leans over the side the chair could tip and injure your...