Somewhere around the second week of planning, you realize the birthday cake is a question with two answers and you are the one who has to pick. You can bake it yourself on the kitchen counter with the mixer going and a kid asking if they can lick the spoon, or you can order it from a bakery and let someone else own the frosting. Both are real choices. The trick is making the choice before party week starts, because party week is when the cake gets decided for you.
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Check which house the party lands in
Before anything else, look at the split week. If the party falls on your row, the cake is yours to plan around your oven and your fridge. If it falls on the other row, the cake has to travel, and that changes whether a homemade layer cake is a good idea at all. A cake that rides in a car between two houses wants to be simple, sturdy, and cold. Write down which house the cake will sit in the night before, and which house the kids will be in when the candles go on.
If you bake it
Check your oven hours honestly. Layers need time to cool before frosting, and frosting needs time to set before the cake can be moved. Count the pans you actually own, the rack space you have, and whether the frosting needs the fridge for a stretch. Pick the bake day early, ideally a night or two ahead, so the cake is not a Saturday morning project with a timer going off in the middle of a bedtime negotiation. Also ask who is frosting. Homemade cakes often end up with one person doing the layers and another person doing the decorating at the last minute, and the second person is usually you.
If you order it
Ask the bakery the questions that matter for a split week. What time is pickup, and does that time fit the hand-off to the other house? How is the cake boxed for a car ride, and is there a flat board and enough room to keep it level? How far ahead do they need the order, and what is the cancellation line if the party moves? Have them read the spelling back to you, because a name on a cake is the one detail every kid notices. If you are too busy to collect it, a helper can handle the pickup as an errand, with the order name, the box, and a clear pickup time written down before they leave.
The question underneath
Be honest about what the cake is for. If you love baking and the kids love watching you do it, the homemade cake is a gift you can actually give in a busy month. If the cake is one more item on a list that already has two calendars on it, the bakery box is not a failure, it is a plan. Nobody at the party is grading the frosting.
Once you have picked, put the cake on the row where it will actually be, and write the bake day or pickup time next to it. The rest of the party usually falls into place around that one decision. For the wider picture of how the two rows fit together, start with The Kids' Week and Mom's Week.