Click on the “Chat” option in the navigation bar at the lower end of the interface. Select a friend from the chat history. Tap the small, rocket-shaped icon. Press “Minis” and choose “Birthdays” from the list of options.
If you are looking for how to get someone’s birthday from snapchat then you must check out the given reference guide below to know more.
How to see Upcoming Birthdays on Snapchat? · Open the Snapchat app · In the Chat page > Tap a friend in the list > Tap Minis > Tap Birthdays · Here …