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Infant development: Milestones from 4 to 6 months

When something's not right

Your baby might reach some developmental milestones ahead of schedule and lag behind a bit on others. This is common. But it's a good idea to be aware of the signs or symptoms of a problem.

Consult your baby's health care provider if you're concerned about your baby's development or your baby:

  • Has very stiff or tight muscles.
  • Seems very floppy.
  • Reaches with only one hand.
  • Hasn't shown any improvement in head control.
  • Doesn't respond to sounds, such as by startling to sudden loud noises.
  • Doesn't reach for or bring objects to the mouth.
  • Doesn't attempt to roll over.
  • Has an eye or eyes that consistently turn in or out.
  • Doesn't babble.
  • Doesn't seem to enjoy being around people or spontaneously smile.

Trust your instincts. The earlier a problem is found, the earlier it can be treated. Above all, delight in your baby's discoveries and abilities.