Looks like my baby is so addicted in watching nursery rhymes on youtube. Can someone give me a tip on how I can control it?

My daughter used to addict to watch youtube clips too, when she was about 4 years old. What I did to eliminate the habit was to tell her to watch 3 clips only. After 3 clips I remove the device from her. Slowly reduce to 2 clips and eliminate it totally. You can try cold-turkey method too. Just tell your baby the ipad/iphone has spoilt and need to throw away. Most importantly, parents themselves need to reduce screentime, especially in front of the kids. I refrain myself from playing handphone when my kids are at home.