Breeding Marmoset Monkeys Guide

Marmosets can be sexed by looking at their genitalia.

The average inter-birth period is 151-156 days. The gestation period ranges from 140 to 146 days. They become less active a few weeks before giving birth. Do not interrupt them when they are giving delivery. It usually takes place at night. Labor takes around one hour. Labor is calculated from the moment the first young notice contractions. The average time between newborns is 2-5 minutes. The female and other group members consume the afterbirth, which usually occurs 10-30 minutes after the birth of the final young. Consult your veterinarian if labor is taking too long (a caesarian can save the female). They almost always have twins. Sometimes just one or three monkeys are born. When you have three infants, one of them usually dies within a week after delivery. One of the three may have to be hand-reared. Don’t underestimate the difficulty of HAND-REARING! The newborns are carried by all members of the household. They sometimes return the newborns to their mothers for suckling. After 30 days, the newborns begin to consume food.

At 40 days, the newborns can live on solid food and milk substitutes.

Suckling normally takes approximately 100 days.

The marmosets may be entirely weaned at 6 months since the breeding female has often given birth again and the subadults begin to understand the parenting procedure for themselves.

Marmosets may reproduce after 15 to 18 months.

Marmosets may survive in captivity for 7 to 20 years.

Hand rearing

Marmosets may give birth to more than two monkeys at a time. Because the mother can only care for two monkeys, the remainder usually perishes within a week after birth. It may be required to hand-rear one of them to prevent this from occurring.

Don’t underestimate the difficulty of HAND-REARING!

During the first three weeks, the children must be given powdered human milk replacement and protein multivitamin concentrate every two hours (0800-2400). 1 teaspoon glucose in 28 mL sterile water for the first feeding (give only 0.3-0.5ml). After three weeks, you may gradually introduce baby food.

You should try feeding them Primilac instead of human milk replacement. This is a milk replacement for NON-human primates!!!

After each feeding, gently touch the anal area with cotton wool soaked in baby oil. This is essential for keeping the anal skin moist.

Keep the babies in a wooden nest box at a temperature of 25-28°C (humidity at 50 percent ).
Provide the child with an “artificial mother” to cling to (like a towel).

After one week, give your monkey one drop of vitamin D3 (twice a week).


  • Newborn: Normally born with eyes open.
    • Head and body: 60-80mm, weight: 30g
    • Body covered with fine gray hair, tail with dark and grayish bands.
    • Ear tufts are absent.
  • 2nd Week: Able to crawl unsupported
  • 3rd Week: Starts to take some solid food from parents
  • 4th Week: Leave parents from time to time.
  • 5th Week: Lap liquids.
  • 6th Week: Head and body: 120 – 50 mm, weight: 70g Milk dentition complete, If necessary they can survive on solid food and milk substitutes
  • 7th Week: Weight: 80g
  • 8th Week: Head and body: 140-70mm – weight: 91g
  • 9th Week: Weight: 97 g
  • 10th Week: Weight: 103 g
  • 11th Week: Small ear tufts become visible (dark gray). Weight: 105 g
  • 12th Week: Independent of parental care.
  • 14th Week: Ear tufts becoming silvery.
  • Suckling ended.
  • 17th Week: Weight: 137 g
  • 20th Week: No longer on adult back.
  • 22nd Week: Weight: 166 g
  • 28th Week: White ear tufts Weight: 174 g
  • 60th Week: Full sexual maturity reached.

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