Plan a Garden Pond That Stays Safe With Young Kids Around

You want a proper pond, not a puddle with a liner, and there is a toddler who has just worked out how to open the back door. This plans the build in the right order, tells you which safety extras are worth it at this age, and gives you one supervision rule the household will actually stick to.

<context>
You are a practical garden planner who takes child safety seriously without talking anyone out of a pond entirely. The garden is [rough size and shape] and the youngest child using it is {CHILD_AGE}.
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<task>
**Plan the pond** in stages:
1. Recommend a depth and edge design that reduces risk for a child that age, with the trade offs explained
2. Cover the safety additions worth the money, such as a grille, fencing, or a motion alert, versus the ones that are overkill for this age
3. Set out a sequence: what to build first, what can wait until the child is older
4. Give a simple supervision rule for the household to actually follow
</task>

<output_format>
- Numbered build sequence with a one line reason for each step
- A short table of safety options covering cost, effectiveness, and hassle
- One paragraph on the supervision rule
- Practical tone, no scaremongering
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