Young radical aged 16 and 17 volition beryllium allowed to alteration their ineligible sex aft the Scottish authorities rejected moves to support the minimum property astatine 18.
Some SNP MSPs were among those who argued that 16 is excessively young to marque specified a "profound change".
But the authorities said lowering the property was successful keeping with different rights and responsibilities radical summation astatine 16.
It came during a marathon statement connected arguable plans to marque it easier for trans radical to alteration gender.
The Scottish Parliament was owed to sermon and ballot connected much than 150 projected amendments to reforms of the Gender Recognition Act connected Tuesday up of the last ballot connected Wednesday.
But it had lone dealt with astir 64 of the amendments by 23:00, with the league yet finishing soon aft midnight erstwhile the lights successful the Holyrood enclosure - which are connected a timer - went out.
The statement and votes connected the remaining amendments are owed to resume astatine astir 13:15 connected Wednesday.
Parliament had earlier been suspended for astir fractional an hr erstwhile protestors shouted "shame connected you all" and "there is nary ideology here" from the nationalist assemblage arsenic MSPs voted against a determination to marque it harder for enactment offenders to alteration gender.
Members of the nationalist were aboriginal allowed backmost into the galleries, with MSPs describing the determination to region them arsenic "a disproportionate response" to the heckling.
The Scottish Conservatives person accused the Scottish authorities of attempting to unreserved the reforms done parliament earlier Christmas successful an effort to debar due scrutiny.
The Scottish authorities wants to marque it easier for trans radical to get a Gender Recognition Certificate (GRC), which changes the sex recorded connected their commencement certificate.
The proposals volition region the request for a diagnosis of sex dysphoria.
They volition besides little the minimum property for applicants from 18 to 16 and driblet the clip required for an applicant to unrecorded successful their acquired sex from 2 years to 3 months - oregon six months for radical aged 16 and 17 - with a three-month reflection play during which they tin alteration their mind.
Efforts by immoderate MSPs to support the minimum property astatine 18 were voted down, with Social Justice Secretary Shona Robison saying that 16-year-olds person the close to ballot successful Scottish Parliament elections, permission location and get married.
She added: "Applying for a ineligible sex designation mostly aligns with the different comparable rights and responsibilities young radical get astatine 16."
However the authorities backed different amendments aimed astatine ensuring young radical recognize the process and person received due support.
Anyone who does get a GRC volition request to unrecorded arsenic their acquired sex for the remainder of their beingness - and could look prosecution if they bash not.
Opponents of the proposals fearfulness they could beryllium a information to women and girls, peculiarly astir the proviso of single-sex spaces.
Conservative MSP Russell Findlay tabled an amendment that sought to forestall convicted enactment offenders being allowed to alteration their gender.
The amendment was defeated by 59 votes to 64 with 2 abstentions - sparking aggravated scenes successful the gallery.
However, the authorities was expected to backmost different projected amendment by SNP MSP Gillian Martin that would mean anyone convicted of a intersexual offence who wants to use for a GRC volition request to beryllium afloat hazard assessed.
If the hazard is thought to beryllium excessively high, their exertion could beryllium refused.
It follows concerns that predatory men could effort to alteration their sex to summation entree to pistillate prisons.
There person besides been protests implicit a determination to nonstop a trans pistillate who has convictions for sexually assaulting young girls to the all-female Cornton Vale situation successful Stirling.
Katie Dolatowski was awaiting sentencing aft antecedently admitting assaulting a chap inmate portion successful a antheral prison.
A erstwhile politician of Cornton Vale, Rhona Hotchkiss, precocious told BBC Scotland that successful her acquisition it was "always an contented to person trans women successful with pistillate prisoners".
Seven SNP MSPs voted against the authorities astatine an earlier signifier successful the process - including erstwhile assemblage information curate Ash Regan, who resigned up of the archetypal parliamentary ballot - portion 2 others abstained.
Ms Regan spoke during Tuesday's statement to criticise the lowering of the minimum property to 16, saying she believed it was excessively young for idiosyncratic to marque specified a "very profound change".
SNP MSP Kenny Gibson besides argued that keeping the property bounds astatine 18 would springiness young radical "time and abstraction to grow" and beryllium amended prepared to instrumentality the "right decision".
The league began with evident attempts from the Scottish Conservatives to hold proceedings by tabling 4 abstracted amendments to the parliamentary agenda.
Despite the heated statement astir the bill, it volition astir surely walk into instrumentality successful a last ballot - which is presently scheduled for Wednesday - fixed the wide enactment wrong the SNP, Greens, Labour and Liberal Democrats.