10 months and no teeth -so its slow and weight is less;you have not mentioned the birth weight of the child,if the childs weight was 2.5 kg or more then this is definitely a matter of concern.
start supplemental
calcium ,your pedia will suggest something like shelcal or calcimax etc and start supplementing vitamind at 400 international units per day.this should show promising results in the next 2 months.
but as your problems look nutritional so you need to look into what are you feeding the child ,was the childs growth appropriate till 6th month ,did the mother take supplemental calcium and vitamind during breast feeding so growth charting and evaluation by a pediatric is important.
Next Steps
evaluate for rickets and anemia.
Health Tips
give your child variety of foods to eat ,give him whatever you prepare at home with less
sugar and no salt.