Not to forget that you are wholly in charge of the quality of food that you put into your babys mouth!

I have learned that each sentence needs to contain subject, verb, object, etc. What is a function of the not to forget at the begining of the sentence? Is this some kind of introductory phrase? Which are the other types of phrases in English?

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    It's the imperative. (Be sure) not to forget that... – Michael Login Sep 18 '17 at 20:39
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    I don't think native speakers use the phrase "Not to forget" in this way. It should be "Don't forget", "Do not forget", "Let's not forget", "Remember", "Never forget", etc, instead. – rjpond Sep 18 '17 at 21:52

There's a similar idiomatic expression "Not to mention that" which means (more or less) "also":

I met a great guy at the gym yesterday. He's smart, he's funny, and not to mention that he's a Libra!

"Not to forget" seems like a made-up phrase based off of "not to mention". I understand from context that it means "keep in mind" but I wouldn't call it "standard" English, or use it elsewhere.

As for what to call it, I expect it's an idiom of some kind, which adds some emphasis to the sentence but otherwise doesn't significantly affect the meaning.

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