"It is apparently a child."
Translation:C'est apparemment un enfant.
C'est is used when it seems to be describing something like "It's a boy" Or "It's a cat in that tree" Il est is used when you know what the thing is, but you are describing it more, so "il est rouge" means it is red and implies you already know what the thing is I am talking about.. and "il est grand" because you would already know who I am talking about.
http://french.about.com/library/weekly/aa032500.htm check this page, it's helpful
Apparently "gosse" (English, "kid") is more likely to be used in a derogatory sense. http://www.larousse.com/en/dictionaries/french-english/gosse/37515 In English, a "brat" (sale gosse) is a disobedient child.
Yes, <<un enfant>> refers to a boy. "A girl" would be <<une enfant>>. Both <<un>> and <<une>> are indefinite articles equivalent to English's "a/an."
<<Ce/cette>> are demonstrative adjectives equivalent to English's "this." Because they are adjectives, they can not stand in place of a noun or subject. Instead, they need to be placed in front of nouns.
Instead of <<cette est>>, you'd need to use just <c'est>>, even for a feminine noun.
<<C'est apparemment une enfant>> is grammatically fine.
As a sidenote, you can use demonstrative pronouns before a verb, like <<ceci est>> and <<cela est>>.<<Ceci/cela>> are used in reference to subjects which you can point to. They aren't ideal pronouns for a person since you can just use <<il/elle>>. However, I think (as I am a non-native speaker) that you could say <<Ceci est un enfant apparement>> and the emphasis would be placed on <<ceci>> (translated as "here"), stressing the location, meaning "Here is a child, apparently." I'm pretty sure that <<apparement>> would need to move in order for the sentence to make sense.