I'll do my best to answer your question. If you're available for chat, let's get started. If not, I can switch to an e-mail format.

You have to be very careful about what you give a newborn as their kidneys cannot concentrate urine as an older person would. Tea, which is basically water since it does not generally contain much in the way of electrolytes, can cause dilution of the electrolytes in the baby's blood. If that happens, the baby's sodium level drops and seizures can result.

What is the baby's age?

I would not recommend giving anything but breast milk or formula to a baby of that age. Anything else could cause problems for him as I described above. What is the reason for wanting to give the tea?

Is the baby breast or formula fed?

can you tell me which one?

similac advance?

Ok. There are a few other options that might be a little safer. I'm assuming the baby is being very fussy after feedings? You could switch to a pre-digested formula that would be a little easier for the baby to digest. Enfamil makes one called GentleEase that is often helpful. If you're not already trying Mylicon or simethicone drops for gas, that may also be helpful (0.3ml up to every 2 hours). At this age a typical term baby will take 3-4 ounces every 3-4 hours. Be sure to burp the baby frequently (after every 1-2 ounces).

thanks for the accept. I'll continue:

The first 4 months of a baby's life can be pretty tough. The normal bacteria in the gut aren't well-established yet, so digestion can be a problem. It's not uncommon for babies to get quite fussy and its very stressful to deal with. Be sure the two of you are able to give each other breaks from caring for the baby and dealing with the crying. If the things I've recommended above aren't helpful be sure to discuss the situation further with the baby's doctor. One last formula that is sometimes helpful is Similac Alimentum, which is even more broken down than the GentleEase is. It's very expensive, however, so try the GentleEase first.

I hope that's helpful!