my baby girl is 7 months and 15 days old from past two days she doesn't sleep at night and in afternoon also I put her to sleep and she wakes up crying why is she doing this

A. hi parent ur kid 7 m old ,and doesn't sleep well at night, avoid sleep in afternoon , make sure u feed the child prior to sleep, change the diapers prior to sleep, keep the lights dim and noiseless, keep room warm and cosy