A life cradle device effecting instant as well as sustained cooling for inducing therapeutic neonatal hypothermia comprising: a rigid thermoplastic skeleton to be either fitted to a basinet or to function independently as a cot housing; characterized by a bedding component comprising: a. a removable water bed or gel bed on which the infant is placed, b. removable one or more second phase change material FS 29 polymeric mattress(es) having a phase change temperature in the range of 27°C to 30°C, the mattress(es) containing polymer blended reinforced organic fatty acid based phase change material placed inside the thermoplastic skeleton, c. removable one or more first phase change material FS 21 polymeric mattress(es) having a phase change temperature in the range of 18°C to 21°C, the mattress(es) containing polymer blended reinforced organic fatty acid ester based PCM placed above the second phase change material mattress to establish direct contact with the infant or below the water bed, d. thermo-chromic indicators incorporated in the second phase change material and the first phase change material to show upper and lower thresholds of required temperature limits, and wherein said device is configured to provide instant cooling of neonate to 33°C and sustain it for a period of at least 24 hours up to 72 hours without recharging. a rigid thermoplastic skeleton to be either fitted to a basinet or to function independently as a cot housing; characterized by a bedding component comprising: a. a removable water bed or gel bed on which the infant is placed, b. removable one or more second phase change material FS 29 polymeric mattress(es) having a phase change temperature in the range of 27°C to 30°C, the mattress(es) containing polymer blended reinforced organic fatty acid based phase change material placed inside the thermoplastic skeleton, c. removable one or more first phase change material FS 21 polymeric mattress(es) having a phase change temperature in the range of 18°C to 21°C, the mattress(es) containing polymer blended reinforced organic fatty acid ester based PCM placed above the second phase change material mattress to establish direct contact with the infant or below the water bed, d. thermo-chromic indicators incorporated in the second phase change material and the first phase change material to show upper and lower thresholds of required temperature limits, and a. a removable water bed or gel bed on which the infant is placed, b. removable one or more second phase change material FS 29 polymeric mattress(es) having a phase change temperature in the range of 27°C to 30°C, the mattress(es) containing polymer blended reinforced organic fatty acid based phase change material placed inside the thermoplastic skeleton, c. removable one or more first phase change material FS 21 polymeric mattress(es) having a phase change temperature in the range of 18°C to 21°C, the mattress(es) containing polymer blended reinforced organic fatty acid ester based PCM placed above the second phase change material mattress to establish direct contact with the infant or below the water bed, d. thermo-chromic indicators incorporated in the second phase change material and the first phase change material to show upper and lower thresholds of required temperature limits, and wherein said device is configured to provide instant cooling of neonate to 33°C and sustain it for a period of at least 24 hours up to 72 hours without recharging.