wtf??is that another girl??what kind of harem shit is this again

I don't think its a girl. They maybe just kinda look like a girl; since it literally said that he is not a girl.

i have a doubt since it's chest was covered like that

Well it's kinda off putting, but the previous body/soul of that child was a man, so nevertheless it still can be considered a boy.

oh well let's just hope the child won't suddenly blush on him and act like a uwu baka