Abstract: This invention is a molded flexible polyurethane foam containing acid-modified polyoxypropyleneamine comprising a polyol, a polyisocyanate, water, and a crosslinker/catalyst of the formulae: ##STR1## where R' is an alkylene radical having from about 2 to 4 carbon atoms, R" is H or OH and R is H or from about 1 to 6 carbon atoms wherein said compound is present in an amount ranging from about 0.05 to 2.00 weight percent based on the combined weight of the polyol and polyisocyanate and wherein the sole blowing agent is CO.sub.2 resulting from the reaction of the water and the isocyanate or wherein auxiliary blowing agents may also be included and are selected from the group consisting of halogenated low-boiling hydrocarbons (e.g. trichloromono-fluoromethane and dichloromethane), carbon dioxide, and nitrogen or mixtures thereof.