Being parent of three, this is important for us to watch out. The following useful extract is from here: http://today.msnbc.msn.com/id/14335112
“Yes, the “Middle Child Syndrome” is very real. Middle kids bemoan their fate as being ignored and often grow resentful of all the parental attention given to the oldest and the baby of the family, and feel short-shifted. Three kids triangulate sibling relationships, with one child at any given point feeling like the odd man out from the chumminess of the other two. .."
"Having a third child also means a changed parenting style. Here you must move from one-on-one to a zone defense. You no longer have one parent per child and everyone gets less individual time and attention. You have to double-up and the logistics get more complex."