My bb is 8 months old. When I carry bb by the armpit. I feel bb is very soft like fragile. Is it not enough nutrients ? Bb is drinking and eating well.

What u describe makes no sense because that's not how a baby is described. Baby should have been going for his vaccinations etc and they will do routine checks for the height and weight. As long as baby is showing some consistency in gaining weight n height accordingly, active, happy, reaching milestones (some pple might take a little longer for some), is playing, then it is ok. If eating and drinking well then how is it that not enough nutrients? Babies are somewhat soft ya