When Leto got pregnant, Hera was told that Leto will give birth to a son who would become to Zeus more dearer than Ares.
wˌɛn lˈiːɾoʊ ɡɑːt pɹˈɛɡnənt, hˈiəɹə wʌz tˈoʊld ðæt lˈiːɾoʊ wɪl ɡˈɪv bˈɜːθ tʊ ɐ sˈʌn hˌuː wʊd bɪkˌʌm tə zˈuːs mˈoːɹ dˈɪɹɚ ðɐn ˈɛɹiːz.