should we hold baby on hand at all time?

My girl (3+ years old) is very lazy to walk. She likes to be carried, especially with grandma who likes to carry her since she was a baby. I don't like to "help" her walk. Do you think keep carrying a baby on hand will become a habit when they turn to toddler? Or I should have carry her even more so the result will be different? any mum has experienced this before? and what was the result when they turn older ?