Nutkins24
Actually I know quite a few young babies who have been prescribed liquid ranitidine and it’s about the same strength as wine, so on that basis I would conclude that it probably wouldn’t do any harm. Certainly no evidence that cider would help with colic (aka a crying baby) though.
Zantac (Ranitidine) syrup is available only by prescription for babies, and it is extremely important to follow dosage instructions to the letter.
"about the same strength as wine" - what does this actually mean?
I do not think 'strength' is a scientific term.
www.healthline.com/health/childrens-health/zantac#interactions
Most people tolerate Zantac fairly well, but it is possible for your baby to have side effects. These side effects may include:
<span class="italic">headache</span>
<span class="italic">constipation</span>
<span class="italic">diarrhea</span>
<span class="italic">nausea</span>
<span class="italic">vomiting</span>
<span class="italic">rash</span>
Drug interactions
Zantac can change how your baby’s body absorbs other medications because of the changes it makes to the amount of stomach acid. It can also affect how the kidneys remove medications from the body. Zantac can block liver enzymes that also break down medications.
.......
so on that basis I would conclude that it probably wouldn’t do any harm
Yes, the comparison with Ranitidine makes it clear that you could fire ahead and give the baby a little wine, or cider, or whatever else you felt in your heart of hearts wouldn't do any harm 
Would a doctor prescribe alcohol for a baby, do you think? It used to be used for teething problems in days of yore. I don't think the practice of rubbing whiskey on inflamed infant gums is officially approved any more, if it ever was.
What makes alcohol ok for a baby in utero but not for a baby afterwards?