Things that make you know you're doing something right.

[Aliantha]

A definition of manipulate.

ma·nip·u·late /məˈnɪpyəˌleɪt/ Pronunciation Key - Show Spelled Pronunciation[muh-nip-yuh-leyt] Pronunciation Key - Show IPA Pronunciation
–verb (used with object), -lat·ed, -lat·ing. 1. to manage or influence skillfully, esp. in an unfair manner: to manipulate people's feelings.
2. to handle, manage, or use, esp. with skill, in some process of treatment or performance: to manipulate a large tractor.
3. to adapt or change (accounts, figures, etc.) to suit one's purpose or advantage.
4. Medicine/Medical. to examine or treat by skillful use of the hands, as in palpation, reduction of dislocations, or changing the position of a fetus.

As you can see, you can choose to view the definition in a negative light if you want, and of course, no one wants to think of babies in a negative light. They're so cute and cuddly and smell nice and they're basically viewed as angelic little creatures who wouldn't harm a fly.

As a parent, I can tell you that I was manipulated by my children when they were babies. What parent can resist for long if their child is crying, even when they've been fed, changed, bathed and fluffed up beyond all niceness...and they still cry. You may even have been cuddling them for hours previously also.

Yes a baby will cry to let you know it wants something. Whether or not it's reasonable is where the manipulation comes into play. Sometimes a baby is simply trying to get more of what it likes, and believe it or not, sometimes we as adults fall for it. This behaviour if indulged often will usually lead to a parent of a two year old complaining that the child just doesn't seem to listen to anything it's told.

I could cite you papers all day on the psychology of children and babies, but it'll be easier for you to do the research yourself if you don't believe me.

When it all comes down to it, whether you like it or not, babies manipulate the adults around them in order to get what they want, just like every other living thing in this planet. Behaviour modification in order to achieve a goal is something learned right for the begining, although it could be argued that some people never learn how to change their behaviour in order to get what they want.