Hi My Kid Is 6months Old..His Birth Weight Was 1.5kg.

Hi my kid is 6months old..His birth weight was 1.5kg. m giving calcium n vitamin d3 n ferium XT drops n also bfolcin drops n from last 4-5 days he has became very cranky.... another doc suggested atarax drops - 6 drops twice a day, junior lanzol 15 - half empty stomach n buffalo milk - small cup twice a day.....my question is. ..is it safe to give these new med. Alone wit older one ???