I'll give you a question, please answer with step-by-step reasoning process.
Passage: Louise Joy Brown (born 25 July 1978) is an English woman known for being the first human to have been born after conception by in vitro fertilisation, or IVF.\n\nQuestion: Based on this passage, when was the first in vitro baby born?

25 July 1978
The relevant information is: Louise Joy Brown (born 25 July 1978) is an English woman known for being the first human to have been born after conception by in vitro fertilisation, or IVF.

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So, the final answer is 25 July 1978