if you are at all unsure, i would check with the ABA free helpline 1800 686 2 686 (in case you need an "authority" to say it catergorically, to make relatives/bystanders leave you alone (with your choice).

i think you gut instinct is leading you in a good direction.
i was astonished, the amount of medical professionals i encountered who had ZERO understanding of breastfeeding, ZERO understanding of what breastmilk is and what it does for babies/toddlers. It can be very offputting, all that misinformation. (told as absolute fact).

i hope your DS is on the mend soon.