Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Poor function and unsafe for nursery

We have been very disappointed with the performance of the bottle warmer. We have used it several times to try to warm up less than 4 oz of milk and it's never warm enough. By the time the item cools down to use it again (10 minutes), the bottle has lost any heat it had. Also, even though it warns not to stay too close to the unit as it heats, my husband and I think the steam which spits out of the heating element is too dangerous for a nursery. We will be returning ours in order to find a better quality and safer bottle warmer.