A specialist in the care of babies is called -

Paediatrician( noun)
English meaning: A medical doctor who specializes in treating infants/children.
Bangla meaning: শিশুরোগ বিশেষজ্ঞ।

অন্যদিকে,
• Veterinarian - A medical professional who specializes in providing healthcare services to animals (পশু-চিকিৎসক)।
• Cardiologists - Doctors who work with the heart and blood vessels (হৃদরোগ বিশেষজ্ঞ)।
• Arborists - A specialist in the care and maintenance of trees (গাছ চিকিত্সায় একটি বিশেষজ্ঞ)।