He acts like he knows so much

My daughter recently started solids and today I wanted to try letting her have some eggs, which is a common allergen so I'm giving her that and nothing else (besides breast milk obvi) to watch for a reaction. My BD started freaking out saying I can't let her have egg yolks. Her pediatrician literally told us that all of the egg is fine, especially the yolks because that's where most of the nutrients are or something like that, but of course he was too busy playing on his phone to listen. Then he proceeds to ask why we don't let her try some toast too, therefore introducing two different common allergens/sensitivities not only in one day but one MEAL. He said it wouldn't be that big a deal but her pediatrician told us to go one by one with those so it's easier to figure out what she's reacting to if she does have a reaction. Oh yeah and he tries arguing with me today about her still being in size 3-6 months clothes (she's been in 6-9 months for the past month and a half) when he literally never dresses her or picks out her clothes and all the clothes she has have been chosen by me or my family members. It just drives me insane that he acts like he knows all this shit about our baby and what's best for her even though he rarely pays attention or does ANYTHING. Anyway rant over.