Suffer  - (CW) The word translated as "Suffer" primarily means "to let go" or "to pass by." This same word is usually translated as "leave," "forgive," "suffer," and "let" in the New Testament. It is in the form of a command.

missing "the"  -- (MW) The untranslated word is the Greek definite article, which usually precedes a noun and, without a noun, takes the meaning of "the one." The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those"). See this article for more. 

little  - This is from the type of children described in the noun.

children,  - "Children" is from a noun that means children and infants up to seven years of age. It is a diminutive form. It is one of several words Jesus uses to refer to "children" (see this article).

and  - The Greek word translated as "and" is used as the conjunction "and," but it also is used to add emphasis ("also"). In a series, it is can be translated as "not only...but also." After words implying sameness "as."

forbid  -  "Forbid" is from a verb that means "to hinder" and "to prevent." It is in the form of a command.

them  - -- The word translated as "them" is the Greek word commonly translated as third-person pronouns in English.

not,  - The negative used here is the Greek negative of a subjective opinion, commands, and requests. The sense is that "you don't want" to do something, not that it isn't done. If it wasn't done, the objective negative of fact would be used. This is the usual negative used in commands.

to -- This "to" is added because the infinitive form of the verb requires a "to" in English.

come  - "Come" is from a verb that means "to come" and "to go." It is a little like we use the phrase "he is on his way,"or "to be under way," which can mean either that he is coming or going with no direct reference to the position of the speaker. Our English word "show up" captures both the "start" and "come" ideas. See this article for more. The verb is an infinitive, that is, a verbal noun, but in English with the idea of stopping an action, we use a different verbal noun, the gerund, "from coming." This is the articular form called the gerund. Like infinitives, gerunds function as nouns, including serving as subjects or objects of a verb, or as objects of a preposition. English adds –ing to a verb to form this part of speech.

unto  - (CW) The word translated as "unto" means "towards," "by reason of (for)," and "against." This is not the "to" that comes from the indirect object form of a noun.

me:  -- "Me" is the regular first-person pronoun in Greek as the object of the verb or preposition.

missing "these ones"  -- (MW) The untranslated word is the Greek definite article, "the." The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those"). See this article for more. It is plural in a form that can be any gender. The form matches to following "such" so "from these of

for  - The word translated as "for" can be treated as supporting a dependent clause, or, in written English, as "this is because..." to start a new sentence.

of --  (CW) This word "of"  comes from the genitive case of the following word that requires the addition of a preposition in English.  The most common is the "of" of possession. However, when this form or word is the object of the verb "to be" the sense is "belongs to," so the sense of this word in this situations is "to."

such  - "Such" is from a word that is a strong form of the word that means "such as this," and "so great a thing." Interestingly, Jesus most commonly uses this word in describing children. With an article, it refers to the preceding, which in this case is "little children." This word and the article introducing it are both in the genitive case, which is used for a lot of purposes (see above).

is -- (CW) The verb "is" here is the common form of "to be" in Greek. It means to have a certain characteristic or remain in a certain condition. It also equates terms or assigns characteristics.  The word also means "to exist" and where it doesn't connect to characteristics or conditions. With the genitive object, the sense is "belongs to."

the -- The word translated as "the" is the Greek definite article. The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those") than the English "the." See this article for more. 

kingdom -- The word translated as "kingdom" can be the region, the reign, the castle or the authority of a ruler. Jesus does not seem to use it to mean a physical region, so its translation as "reign" or "realm" seems more appropriate. This is especially true because the "reign" of a king means the execution of his will.

of -- This word "of"  comes from the genitive case of the following word that required the addition of a preposition in English.  The most common is the "of" of possession,

missing "the"  -- (MW) The untranslated word is the Greek definite article, which usually precedes a noun and, without a noun, takes the meaning of "the one." The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those"). See this article for more. 

heaven: - (WN) The word translated as "heaven" means "sky," the "climate," and the "universe."     It also meant the home of the gods in a physical sense: the sun, moon, and planets were named for the gods. More about the word in this article.  This word is plural, not singular, so "skies."