Portable baby carrycot and baby stroller

A baby stroller, comprising:

• a frame comprising a first side and a second side opposite to each other, the first side and the second side having a first groove and a second groove, respectively;
• and
• a baby carrycot, comprising:
• a carrycot body comprising a first side wall and a second side wall opposite to each other, and a support plate at a bottom, a lying area being above the support plate;
• a support assembly configured to support the carrycot body, the support assembly comprising a connection assembly for connection with the frame, the connection assembly comprising a first connection assembly on the first side wall and a second connection assembly on the second side wall, and the first connection assembly and the second connection assembly being configured to engage with the first groove and the second groove, respectively;
• a piezoelectric sensor arranged in the lying area to detect a respiratory movement of a baby;
• a signal processing circuit configured to receive and process the respiratory movement detected;
• a controller configured to generate a prompt message indicating a sleep state of the baby when the received and processed respiratory movement satisfies a preset condition;
• and
• an alert device configured to provide a caregiver with the prompt message indicating the sleep state of the baby;
• wherein a length of the piezoelectric sensor is greater than a width of the piezoelectric sensor, and a direction of a connection line between the first connection assembly and the second connection assembly is orthogonal to the direction of the length of the piezoelectric sensor.