15–22 Days
The gestation period (pregnancy period) of hamsters typically ranges from 15 to 22 days, with slight variations depending on species, individual differences, and environmental factors. Below is key information synthesized from research findings:
1. Gestation Period Range
Most sources indicate a pregnancy duration of 15–22 days, with:
The shortest recorded at 15 days (common in dwarf hamsters);
The longest at 22 days (larger species like Syrian hamsters may have slightly longer periods);
The most common range being 16–18 days.
2. Species Variations
Syrian hamsters (teddy bear hamsters): Gestation often approaches the upper limit (18–22 days).
Dwarf hamsters (e.g., Roborovski, Campbell’s): Typically shorter (15–18 days).
3. Signs Before Birth
Abdominal Enlargement
The abdomen becomes visibly round and pear-shaped 10 days after conception.
Behavioral Changes
Nest-building, increased appetite, and rejection of male hamsters.
Physical Symptoms
Mammary gland development ("double row of buttons" protrusion) and vaginal discharge.
4. Care Considerations
Separate Caging
Immediately separate males and females after mating to prevent fighting.
Environmental Prep
Maintain a temperature above 21°C and provide wood shavings and cotton for nesting.
Emergency Handling
If contractions last over 2 hours without delivery, seek veterinary care immediately.
Tip: If a hamster’s abdomen is swollen, birth typically occurs 7–9 days later.
Note: Key data and care instructions are bolded for emphasis, with clear section headers and bullet points to enhance readability.