"Flat Pack" (S2 E24) and "Baby Race" (S2 E49) Are my most favorite and bring out tears every time.

Then there is "Granny Mobile" (S3 E33) which cracks me up every time.

Even my 7 year old daughter knows this and uses Bluey to cheer me up if I am in sour mood.

Don't even get me started on Shaun the Sheep. My daughter and I have re-watched everything there is about Shaun the Sheep and laugh in anticipation before the funny things actually happen.

Edit: I absolutely love the minisodes where Bandit tells kids bedtime stories (Goldilocks and Three little pigs). I wouldn't be surprised if the voice actor just went off and made up bunch of stuff which they animated later.