The sleepytime episode may be a little emotional for younger kids but it's a heartwarming episode and is completely okay to show to that audience.
In the episode "Copycat" Bluey and Bandit find an injured bird and take it to the vet. The bird dies and Bluey and Bandit are both very distraught which may also make viewers sad especially younger ones who don't understand death.
We find out Bluey's aunt Brandy struggles with infertility which may be difficult to watch for viewers who have experienced this.
The episode "Early Baby" focuses on premature birth which may be hard for some young viewers to understand.
This series has many poignant moments and some episodes touch on topics such as death, fear of abandonment, premature birth, neurodivergency and divorce just to name a few.
The episode "Granddad" touches on the topic of anticipatory grief. Chili is constantly telling her elderly father to rest when he wants to spend time playing with Bluey and Bingo after he is recovering from "heartworms."