The Canadian holding centres, which are off limits to the public, resemble medium-security prisons. They are surrounded by razor-wire fences and kept under surveillance by guards.
There are three such facilities across Canada, in Vancouver, Toronto, and Laval, Que. In some provinces, asylum seekers are detained in prisons.
A recent McGill University study found that detention can be a "frightening experience" for children, leaving them with "psychiatric and academic difficulties long after detention."
Inside, boredom is "pervasive," as children are often left "idle, sleeping or lying on the couches for long periods during the day."
The study examined the experiences of 20 families who were detained in the Toronto and Laval holding centres and found that, in nearly half the cases, children ended up being separated from their parents at some point in the asylum-seeking process.
In detention, mothers are normally permitted to stay with their children. Fathers, on the other hand, are kept separate and only allowed to visit their spouse and children twice a day for about 15 to 30 minutes, according to the study.
In some cases, detained asylum seekers have lived in the country without status for years. In detention, they are given the option of keeping their Canadian-born children with them or sending them to live with extended family or in the custody of provincial youth protection services.
The minors detained last year spent an average of 13 days in custody, but the time period can vary significantly.
The study recounts how, in one instance, a six-year-old girl detained for more than six months asked her parents, "Are they gonna keep us here permanently?"