My parent in law let my 4 month old taste milo

Firstly, don’t panic. Small amount should be fine. I know you’re worried about the little amount of sugar intake but it’s really fine. Secondly, do advise everyone around you to ask your permission BEFORE giving anything to your baby. Reason being, you are still new and learning about what kind of allergies your baby might have to certain foods so it’s really best to ask you first to avoid any future misunderstandings. Tell them they wouldn’t want to be responsible if anything happens to your baby in the event he/she has an allergic reaction and is connected to the food/drink source given by them. Finally, talk to your baby in front of those people, and tell your baby he/she should not consume anything without your permission. Doesn’t matter if your baby understand or not. As long as the people around you understand. My in-laws have the habit of feeding my daughter anything and everything to the point where I’ll be so frustrated and throw a face to them. I am a germaphobe and they like to feed from their own bowl, straw or utensil and I absolute hate that. I’ll just tell them off through my daughter saying “Baby, no. Enough. No more. Later you sick, how? You go hospital, how? Stop it. Enough.” Or “Baby, did you ask my permission whether you can have it?” Lol.