Periodic developmental milestones refer to the typical developmental skills that babies and children demonstrate at specific age periods. These milestones are used to monitor the healthy development of babies and children and to determine if there are any delays or issues in their development. Here are some important developmental milestones in babies and children:

1. From Birth:

• Lifting and holding the head
• Making eye contact
• Mimicking facial expressions
• Recognizing voices

1. 1-3 Months:

• Displaying social smiles
• Grasping hands and feet
• Turning the head in prone position
• Reacting to loud noises

1. 4-6 Months:

• Maintaining a sitting position
• Grasping and bringing objects to mouth
• Making cooing sounds
• Tracking faces and objects

1. 7-9 Months:

• Crawling or creeping
• Standing and walking with support
• Self-feeding and using a cup or a glass
• Uttering first words

1. 10-12 Months:

• Walking while holding onto furniture
• Placing objects into boxes or containers
• Understanding words and following simple commands
• Using gestures like waving or blowing kisses

1. 1-2 Years:

• Forming two or three-word sentences
• Solving simple puzzles
• Self-feeding and dressing independently
• Making scribbles with a ball or crayons

1. 2-3 Years:

• Articulating and comprehending more complex sentences
• Recognizing names, colors, and numbers
• Controlling objects with both hands
• Playing with friends and sharing toys

1. 3-5 Years:

• Understanding and telling more complex stories
• Recognizing numbers and letters
• Engaging in more complex social play
• Engaging in more complex construction and creative play

These milestones can vary in each child’s development and serve as a general guideline only. Parents and caregivers should monitor their child’s development and consult a healthcare professional if they have any concerns.