It was narrated that Anas said:
"The Messenger of Allah (ﷺ) said: 'The man's water is thick and white, and the woman's water is thin and yellow. Whichever of them comes first, the child will resemble (that parent).'" (ES)
English reference (ES): Vol. 1, Book 1, Hadith 200 (ES)
Arabic reference (ES): Book 1, Hadith 201 (ES)