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).'" (RU)
English reference (RU): Vol. 1, Book 1, Hadith 200 (RU)
Arabic reference (RU): Book 1, Hadith 201 (RU)