How to prepare first born as I am giving birth to second born soon. My boy is 4 years old.

Hey! Congrats on your upcoming arrival! Four years old is actually a really good age for this, they understand enough to be involved, but are not so set in their ways that change feels threatening. A lot of mums I know found it helpful to let the older one "help" with baby things early on, like choosing a soft toy for the baby or sitting in during bump check-ups, so they feel included rather than replaced. Some mums swear by reading simple big-sibling books together to open up the conversation naturally, while others felt their child understood better just through honest, straightforward chats about what to expect (less crying, more changes to routine than they expected, honestly). My neighbour made a point of telling her son that the baby would need a lot of attention at first but that his role as older brother was special and different, not lesser, and she said that framing really stuck with him. The main trade-off I'd say is between over-preparing them with too much information versus keeping it simple and age-appropriate; at four, short and honest tends to land better than long and detailed.