Asking the Parents of Small Children to be Quiet in Public Areas
"希望您能多照顾一下您的孩子，他们经常吵闹，影响我们生活和休息。" (Please take good care of your kids, because they are so noisy and badly influenced our lives.)

Try not use "大叫" on your note, because that sounds like a bad comment on their kids, which may make them unhappy. Better use "我们" to show that you are a "general neighbor" like the others, instead of someone who cannot fall asleep due to your own reason (medical/phycological maybe, who knows). This politely tells them it is their fault, not yours.

Also, having both Chinese and English would also help, as is suggested in the comments you got.