How do you bring your infant to a restaurant?

Gi
I've seen some people bring their entire carseat with their baby in it. I'm gonna buy one of those "forever car seats" that converts from an infant car seat to a toddler booster seat. So it's gonna be chunky and I'd rather just leave it in the car. What other options are available for when you want to bring your infant to a restaurant with you and you don't know where they should sit and how? I'm pretty sure a high chair is for older infants... when they can hold their head up on their own...