It is easy to setup birthday alerts on iPhone and make sure that you never forget birthdays of important people in your life. You first need to tell your iPhone the birthday dates of your family members, friends, and relatives. This can be done using the Contacts app on iPhone, which allows you to add Birthdays and important dates in its Contact details section. Your iPhone can alert you on the day of the occasion, 1 day early, 2 days early or a week before the birthday.
This is for the iPhone

Couple of Prelimanary Steps
First, you must have notifications enabled for your Calendar app. To turn this on, visit:
Settings > Notifications > Calendar
scroll down and set the toggle beside Allow Notifications to On. Now, exit Settings. Refer to below image:

Also, you will need to have some birthdays defined in your Contacts app. To do this, open Contacts, tap a contact from the list, and select Edit. Next, tap add birthday. See below image:

Set a Birthday Notification
Now, exit Contacts. To turn on automatic Calendar birthday reminders, open Settings, scroll down and tap your Calendar app. See following image:

Next, in Calendar settings, tap Default Alert Times. Refer to below image:

Now, in Default Alert times, select Birthdays. See below image:

Next, on the Birthdays screen, you can pick a time when Calendar will alert you about upcoming birthdays. You can choose On day of event, 1 day before, 2 days before, or 1 week before. For the first three of those choices, your Calendar app will notify you at 9 a.m. on the day you selected. See following image:

Now, exit Settings. When the proper alert time comes, your Calendar app will send you a notification about the birthday. Refer to below image:

Depending on your notifications settings, you can potentially see this alert on your Lock Screen or Notification Center as well as via pop-ups on your screen.
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