New moms are entitled to a glass of wine or a pint of beer at the end of the long day. But baby has more than 20 years before drinking is legal. Moms can prevent passing alcohol onto little ones by testing their breast milk. MilkScreen are disposable test strips that indicate the volume of alcohol concentrated in breast milk. The presence of alcohol in breast milk varies and is based on mom's weight, the amount she drank and whether she had a meal with her cocktail.