Could be a lot of reasons. Keep up the great work, mama!
Mine was born the same day. She's whinging too, going through a leap. Check out the wonder weeks app if you haven't already. It helped me put my mind at ease about her moods
You are an amazing mamma!! It’s bloody hard and you are not alone. Mines still waking several times through the night, born 21st - god knows when we will get a full nights sleep.
Could be regression, could be teething, could be a leap. My little boy was born 28th august 🥰