After birth Neonate does various physical activities to:

After birth, neonates (newborns) undergo several physiological processes to adapt to life outside the womb.

• These processes involve various physical activities to support the baby’s survival and healthy development, including digestion, heat regulation, and immune system development. 

Key Points

After birth Neonate does various physical activities to:

• Digestion: Neonates begin the process of digesting breast milk or formula shortly after birth, which is essential for providing the necessary nutrients for growth and development.
• Heat Regulation: Since neonates cannot regulate their body temperature as effectively as adults, they engage in physical activities (such as crying or moving) to maintain body temperature and adapt to the external environment.
• Develop Immunity Power: The neonate's immune system is still developing, and activities such as sucking, swallowing, and exposure to breast milk help boost the infant's immune defenses by providing antibodies and nutrients necessary for immune function.

Hence, the correct answer is 'all of the above'.