What is the normal weight for 19 month old baby?

There are child growth standards by World Health Organization (Birth to 2 years):

• Weight for GIRLS: who.int/childgrowth/standards/cht_wfa_girls_z_0_2.pdf?ua=1
• Weight for BOYS: who.int/childgrowth/standards/cht_wfa_boys_z_0_2.pdf?ua=1

All weight before red line it is normal weight. All weight from red line before black line it may mean you need to see a pediatrician.