Breastfeeding is an ideal choice for infants, but if the mother is using marijuana – risks outweigh the benefits. THC is a fat-soluble liquid, which goes through the mother’s bloodstream, and stored in body fat, resulting in high concentrations in the brain and body. THC accumulates in the mother’s breast milk and may produce severe cognitive and behavioural consequences. Infant may also show signs of sedation, reduced muscle tone, poor sucking response, and digestive issues. Other effects include; irritability, excitability, exaggerated startle responses, and diminished crying in newborns. Some studies have found decreased motor development at 1 year of age.