These two clauses have similar meanings, repeated for emphasis. In some languages it is more natural to emphasize this in another way. Alternate translation: "Be sure to allow the little children to come to me" (See: [[rc://en/ta/man/jit/figs-parallelism]])
The kingdom belonging to people represents the kingdom including them. Alternate translation: "the kingdom of God includes people who are like them" or "because only people like them are members of the kingdom of God" (See: [[rc://en/ta/man/jit/figs-metaphor]])