Y here in canada they recommend to introduce food to babies at 6 months? any everywhere else they start at 4 months? when should i start?

6 months: Years ago, breastfeading was frowned on & many made "formula" from boiled cow milk&karo. Since cow milk is designed for calves, infants were fed early & often to make up for deficiences in cow milk. Now that breast is back, or formulas mimic breast, solids are optional. The sitting child is more capable of participating & few sit before 6m. Babies can wait past a year and thrive.

Food for babies: I usually go by 3-6 months or 13-16 pounds as guidelines to introduce solid foods. The aap recommends 6 months but if a child is not satisfied with breast or fomula its time to feed him instead od torturing your child and/or yourself.