This is an educated guess for "negativo" - in the same sense that photos can be produced from a negative, thus making the negative the original.

HTH

This would apply if the child was born dead.

I've seen this in my practice.

Maybe that is the case in your context?

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Note added at 2002-09-11 07:46:05 (GMT)
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Viendo ahora tu pregunta sobre \"promovido/conste\", pienso que este certificado negativo podría ser un certificado expedido por el Registro donde deja constancia de que NO se inscribió un nacimiento dado, o sea que se incurrió en una omisión. Entonces la traducción podría ser \"certificate of birth entry/record/filing omission\" o algo por el estilo.

i.e. certificate that the child was NOT born in Benidorm? ... just a guess

I.e. a certificate which excludes the possibility of something, e.g. being born in Benidorm, at least according to the official records held there.

I looked for contexts for the Spanish phrase and it is used in that sense in a number of legal and quasi-legal contexts.

And I have found a number of citations for "exclusion certificate" -- though the term has a wide application in a number of different contexts. Nevertheless, it might do as a translation if something better doesn't come up.

Vostock Shipping Co Ltd v Confederation Ltd - ... Permanent registration was subject to production of, inter alia, a bill of sale and a deletion or exclusion certificate (a document evidencing the fact that ...
http://www.maritimelaw.orcon.net.nz/1699.html

SALES AND USE TAX REGULATIONS (PDF) - ... as a part of the factory-built housing package. (d) EXCLUSION CERTIFICATE. All retailers who make retail sales of "factory-built ...
http://www.boe.ca.gov/pdf/reg1521-4.pdf Search within this site

Taxpayer Services Division Technical Services Bureau (PDF) - ... it is presumed that no receipts are from a sale of aviation fuel unless the purchaser furnishes the seller with a valid Aviation Fuel Exclusion Certificate ...
http://www.tax.state.ny.us/pdf/memos/Corporation/m83_22_7c.p... Search within this site

West Virginia Forms on SuperForm 2000 - STF Services - ... Certificate of Nonresidence. WV/IT-104.1, Low-Income Earned Income Exclusion Certificate Election to Not Withhold State Income Tax. WV/IT-105, ...
http://www.stfservices.com/content\wv.htm

Access to Information - ... The Appeals Tribunal is precluded by Clause 33(5)(b) for overruling the decision of the Executive in respect of "exempt matter" or an "exclusion certificate ...
http://www.ijchr.com/Access to Information.htm

New Pig Leak & Spill Absorbents - ... If EPA or the authority in jurisdiction over the state's stormwater program approves the application, the exclusion certificate replaces a NPDES permit. ...
http://www.newpig.com/NPdoc/static/tech/techDocs/techDocStor...

Jones King uk Environmental Protection Policy - ... Require that all relevant specified manufacturers complete a Deleterious Materials Exclusion Certificate before their product is incorporated into the works. ...
http://www.jonesking.com/environ.html

hacien 4814 retenci.n del 7% (PDF) - ... District. 43. Can an exclusion certificate from withholding be granted to an entity that is not subject to the 7% withholding? Yes. ...
http://www.hacienda.prstar.net/downloads/pdf/folletos/retenc...

CONTROL F APPENDIX 3 - Routine Investigation Of Foodborne ... - ... work. A letter and exclusion certificate confirming this will be sent to all relevant persons by the Department of Public Health. ...
http://www.show.scot.nhs.uk/nhslanarkshire/hq/public_health/... ENDIX%203.htm

Chairack order page. - ... As it is a disability aid it does not incur VAT to a qualifying individual, and subject to the exclusion certificate below being signed. ...
http://www.delcane.co.uk/page3.html

12601 TGCP Travelbag (PDF) - ... Failure to notify them may cause your circumstances to fall within a policy exclusion. CERTIFICATE NO: TBG/02M ANNUAL - MULTI-TRIP ...
http://www.travelbag.co.uk/insurance/policies/multi.pdf

openingday - ... A tremendous amount of work goes into organising opening days and thanks is given to Harry West for dealing with the CAA's exclusion certificate and the ...
http://www.westcalderflyingclub.freeserve.co.uk/openingday.h... Search within this site

THE ROBERT GORDON UNIVERSITY Principal Statement of Terms and ... (PDF) - ... receiving Statutory Sick Pay and employers have a responsibility to notify such employees that they are excluded by issuing an appropriate exclusion certificate ...
http://www.aut.org.uk/campaigns/cascamp/rguterms.pdf Search within this site

Payroll Processing Service (PDF) - ... 27 Payroll Deduction Form.....29 Clergy Housing Allowance Exclusion Certificate ...
http://www.episcopalmn.org/PayrollService_Manual.pdf

HUDSON, NEW YORK - ... If the animal is determined not to be covered by this section, the dogís owner shall be given an exclusion certificate demonstrating that the animal is not ...
http://www.rott-n-chatter.com/rottweilers/laws/passed_laws_N...

MCHRD Homepage - ... Deduction Authorization or Cancellation - Change of Address/Personal Data Form - Michigan W-4 Tax Withholding Certificate - Michigan Tax Exclusion Certificate ...
http://gurry.com/mchrd/forms/payroll_forms.html

Despite the inconclusive nature of my suggestion, I hope that it helps in some way in your search for an appropriate translation for this term.