I have question in my head, asked my mum about it, and she tells me, I was born early. 1 week before oct 15, and I was early born on oct 8.
I'm 1 year younger then him, hes 1 year older then me
And There could be any reason why? hes strong,Fast at running etc.
And we don't do look-like. I'm not strong and NOT fast..
NO, My mum never had sex with other men. WHAT HAPPENING?
I just laughed like hell! But to help you, it may be genetics, he got the best things from you dad and you mom, and you were less lucky, try working out and you'll be stronger.
When a sperm finally makes it's way inside the egg, there are over 220 million different combinations of genetic material possible, that should answer your question. A variety of factors that occured before insemination on both your mother's and father's side will determine your outcome. It's a cruel world, I guess?
Babies that are born early (before the expected date) can be weaker (but one week shouldn't make much difference I guess?)
Siblings don't necessarily have to be very equal. Maybe you have more genes from your mother and your brother more from your father or the other way round.
Maybe your mother took drugs when she was pregnant with you or someone punched her in her stomach...