My monk parrot playing with my cockatiel birds !! 

Yes they do eat cockatiel seed mix along with sunflower seeds. It is common 4 months is a small baby cockatiel give him green veggies frequently

@mbapetswala OK, thank you. I am trying to give him different fruit tree branches as well as sliced apple and cucumber some time. I am afraid he is not getting enough food. He looks thin and not enough weight.

​@@englishsimple1052 Pls measure his weight and tell me try giving hand feeding formula he might be unwell.better take measures early

@@vinaychintapatla929 how do I know that he is unwell?

@@englishsimple1052 he will be less active and eating less. Show signs of lethargy. Try to give hand feeding formula so he doesn't loose weight.