This is where we are at:
The World Health Organisation declared in May 2019 that transgenderism is not a mental illness.
Children who present as transgender are not, therefore, mentally ill.
The UK's NHS clinic to which gender questioning children are referred reports a 5,337% increase in girls (1,460% increase in boys) presenting as transgender in under a decade. The gap between boys and girls being referred continues to widen year on year.
80% of children who claim they are transgender reconcile their gender identity with their biological sex over time if they are monitored and supported but left unmedicated.
Advocates of prescribing puberty blockers, designed for short-term use for the treatment of a specific medical condition (precocious puberty) claim that children will suffer mental distress and suicidal ideation if they are denied medication, contrary to the WHO's announcement that transgenderism is not a mental illness.
A 30 year Swedish study found that "mortality from suicide was strikingly high among sex-reassigned persons...after adjustment for prior psychiatric morbidity. In line with this, sex-reassigned persons were at increased risk for suicide attempts." Physical transition (of which puberty blockers is the first step, as children medicated in this way are significantly more likely to go on to cross sex hormones and surgery in their late teens) does not decrease suicidal ideation amongst transpeople.
The evidence available relating to puberty blockers indicates that their use leads to osteoporosis, compromised immune systems, sterility, arthritis, impaired pituitary function and lowered IQ. These adverse effects become more severe the longer the drug is taken. Research suggests these effects can not be completely reversed by stopping the medication.
Trans-supportive websites play down the side effects, tending to refer only to bone density and emphasising that any side effects are completely reversible, contrary to most current available evidence.
Children who are physically and (officially) mentally healthy are being prescribed medication designed for short-term use over the long term, in some cases for 6-7 years.