Translation:This man, this woman, this child
And here again kid doesn't works in the same sentense: http://s017.radikal.ru/i400/1512/cb/265fa55ddf0f.png
You look at the basic, Nominative form of the noun.
If it ends with a consonant, it's probably masculine.
If it ends with -a, it's probably feminine.
If it ends with -o, -ę, -um, it's neuter.
There will be exceptions (like here, "mężczyzna" is masculine), they will be even among common words, but generally the above should be your first thought.