Board Thread:Character Discussion/@comment-30235980-20161015165325/@comment-91424-20161016000239

"Manhattan" is no problem. Yes, as Farerb points out, less than a year passes between "Pilot" and "Manhattan" (we know this because in in "The Tower", David states that it's been almost 30 years since Emma was born; since "The Tower" takes place one year after the first half of Season Three (as seen in "Going Home", which takes place several weeks after "Manhattan"), this means that less than a year passes between "Pilot" (where Emma turns 28) and "Going Home".)

However, Emma arrived in Storybrooke on her 28th birthday, and Emma was born on October 22. 1983 (read her trivia section for more details). Ergo, she arrived on October 22. 2011. If Henry was born on August 15., it means that it's already been two months since his tenth birthday, so even if less than a year passes between "Pilot" and "Manhattan", he could still be eleven (or nearly eleven - people often round up their age for convenience) in "Manhattan".