hi need an experts advice on this . do all paediatrician check the head circumference ,weight n weight of the baby ? if yes how often ?

Yes in the first year at every doctors visit. And these measurements are done at least till three years although length and head circumference may not be done at every visit.

my doc only checks the weight .he has never checked the length n head circumference till date. wen my baby was 4.5 months he asked me to start with semi solid food.