Explain simply why 25 July 1978 is the correct answer to: 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.

Question: Based on this passage, when was the first in vitro baby born?. Explanation:
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.