My little boy since he was born has always held his arms out and back when being held.
He is now 8 months and still does this, he doesn’t hold on to me when held, his arms are always straight and pointing behind him.
He also doesn’t put his arms out to be picked up, when I try to clap his hands together his arms go stiff and he pulls them away from me.
Same applies when I try to pass him a toy or food his arms go stiff and he pulls away.
If let with toys/ food he will pick them up eventually on his own but it worries me why he goes so stiff :(