In the first few months of life, your baby relies on crying and other nonverbal communication to tell you what she wants and needs. At about three months, she may start "playing" with sound by gurgling, cooing and babbling...
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As hard as it may be, giving your toddler more independence could be a boon for both of you. She'll learn faster, gain self-confidence and be more comfortable on her own. Here are some techniques: Let her make her own decisions (within limits, of course), such as what to wear. Find chores she can help with, like folding towels or putting away the silverware. Whenever possible, let her do things her way, even if it takes longer. Ease separation anxiety by reassuring her you'll be back and gradually increasing the time you're away.

Source:
“Help Your Child Become More Independent,” http://www.babycenter.com/0_help-your-child-become-more-independent_11736.bc

Thumbsucking is a natural reflex for babies, but as kids get older, it can affect teeth alignment and proper growth of the mouth. If your child still sucks his thumb by the time his permanent front teeth are ready to come in, help him kick the habit by praising him for not sucking, rather than scolding him when he does. Remind him not to suck by putting a bandage or sock on his hand at night. Ask your pediatrician to prescribe a bitter medication to coat the thumb.

Source:
“Thumb sucking,” http://www.ada.org/2977.aspx?currentTab=1 Updated May 04, 2010.