This is from WHO pamphlet guiding principles complementarry feeding of the breastfed child
Practice exclusive breastfeeding from birth to 6 months of age, and introduce complementary foods at 6 months of age (180 days) while continuing to breastfeed.
In environments where environmental sanitation is very poor, waiting until even later than 6 months to introduce complementary foods might reduce exposure to food-borne pathogens. However, because infants are beginning to actively explore their environment at this age, they will be exposed to microbial contaminants through soil, etc. even if they are not given complementary foods. Thus, the consensus is that six months is the appropriate age at which to introduce complementary foods
Start at six months of age with small amounts of food and increase the quantity as
the child gets older, while maintaining frequent breastfeeding. The energy needs from complementary foods for infants with ?average? breast milk intake in developing countries (WHO/UNICEF, 1998) are approximately 200 kcal per day at 6-8 months of age, 300 kcal per day at 9-11 months of age, and 550 kcal per day at 12-23 months of age.
In industrialized countries
these estimates differ somewhat (130, 310 and 580 kcal/d at 6-8, 9-11 and 12-23 months, respectively) because of differences in average breastmilk intake.
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They have a pamphlet for the non breastfed child, information is basically the same
I read it as saying you should start a 6 months
I downloaded the pdf's from WHO website, they are easy to find and interesting to read