*1.Generally, 小不点 is a nick name used by the older without age line, you might use them to the infants, little kids, even teenagers if you are way older them them, you use this word means you love them, you care about them, but of course you do it a right way like with a nice smile on your face. *2. 小不点 is used to without emotional factors to describe someone is physically small, but seldom people enjoys being described in this way.

“小不点”形容事情或东西极小。但基本上不会用这个意思。现在往往用在称呼上。1，给自己喜爱的宠物取名字叫“小不点”；2，是对自己个子娇小又可爱的女朋友的昵称“小不点”；3，对年龄小个子矮的而有着让大人惊讶的想法的小孩子的叫法“小不点”。

OMG, something was just wrong with my keyborad, and I don't actually know how to delete it.lol.小不点 is not a word we use that often.but still, it's a casual way(and mainly used) to describe little child when using as a noun. I don't think there's an age line to differ a child from being a 小不点. It's just whenever you think a child is little and cute.For example, my grandfather thought I was a 小不点 when I was almost 20, which I wasn't happpy about.lol

When I was student, my classmates used this word to called someone height short. So it's a nickname.

this word means lovely or naughty small child，pet。。