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Please look at this sentence.

"He suggested that policies emphasise that complementary foods must provide full nutrition for children between the ages of seven months and three years"

[1]Please check whether or not the sentence is right.

[2]When reading this sentence, I suddenly recalled this sentence. "He suggested that you (should)see a doctor.
I think the verb "suggest" used in the sentence above is the same meaning as this "suggest". Can I omit the auxiliary verb "must" there?
Like this.
"He suggested that policies emphasise that complementary foods provide full nutrition for children between the ages of seven months and three years"

Thank you for your answers in advance.
Comments  
I would say "He suggested that policies emphasize that complimentary foods must be nutritionally complete for children ages seven months to three years."

I wouldn't just remove "must" without somehow replacing it. It makes it clear that it's absolutely necessary, not simply recommended.
Thank you so much,Mr.Douglas JohstonEmotion: embarrassed. In your expression, I want to ask you for "children ages seven months to three years"

Can I write like this as well? "children ages which are from seven months to three years".

I think sometimes a native speaker like you doesn't put "from" in the expression "Children ages seven months to three years".

Regardless of putting "from" or not there,is it okay? Thank you for your additional answer in advance.
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No, something like "children ages which are from seven months to three years" does not sound like natural English. Just get rid of the "which are from" and it's OK. I'm sure you could write it in a longer form, but that is the most concise way to write it.
I've many times seen the expressions like "from.....to.....". But to native speakers like you, this expression "children ages from seven months to three years" is not natural.I need to learn more. Thank you so much for your warm teachings,Mr.Douglas JohnstonEmotion: embarrassed.
These are all possible:

... for children between the ages of seven months and three years
... for children aged between ... and ..
... for children from ... to
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Ah~ Thanks to your kind answer, I could more understand what Mr.Douglas Johnston has pointed out to me. Thank you for your answer,Fivejedjon.