You are fortunate that you have sweet ones, but you also have BABIES. They will likely be like that until they are about a year. With constant handling they MIGHT stay pretty tolerant of cuddling. Taking a similar approach with an adult bird would not be wise as it would likely lead to increased fear and resentment.
But not being "cuddly" doesn't at all mean you can't have an incredibly deep, loving, and strong relationship. Irns are my favorite species. I have several and I wouldn't trade them for the world. They are incredibly affectionate IN THEIR OWN WAY, that way just happens to be completely different from species like conures and cockatoos.
You just have to be willing to love them for who they are. Also, 5 weeks is really not long in terms of bonding. Give him time, love, patience, and a lot of treats and and mental stimulation.
I have found that my birds love to preen and groom me even when they prefer me not to return the favor.
They also love to get in the way of everyday life. They want to interfere in everything
Also I find a lot of our bonding takes place just by having new experiences together. They have huge brains and love to use them. Just like any friendship it's important to find things to do together that you both enjoy, and respect each other's boundaries.
And of course... treats...
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