Anyone else experience this? And find anything that helped?

My 5 1/2 month old sleep through the night at 3 weeks. Up until 2 weeks ago she slept perfectly fine. Now she wakes up every 2 hours to eat. 🤦‍♀️ 2 hours on the dot!

With my first I didn’t have this issue. She would wake up once or twice and that was it she Disnr sleep through the night till she was about 1 year old. She’s now 1.5 years old.

So now I have my second she’s 5 1/2 and omg every 2 hours is hard😩