No. If it was negated, then it would be "Nie bierzemy tego dziecka".

"brać" takes Accusative, "dziecko" is neuter, so its Accusative is identical to its Nominative.

Looks like a correct sentence (apart from the typo: chciałbyś), but the idiomatic phrase is usually "A może frytki do tego?" :)

Oh, actually I guess it should be "Chcielibyście"/"Chciałybyście" - 2nd person plural, as the sentence here was 1st person plural :)