firstling

noun 0.787

lastborn

noun 0.755

eldest

noun 0.722

secondborn

noun 0.702

primogenitor

noun 0.669

primogeniture

noun 0.644

baby of the family

noun 0.643

oldest

noun 0.637

only child

noun 0.616

firstfruit

noun 0.610

first

noun 0.601

youngest

noun 0.600

single child

noun 0.579

newborn

noun 0.579

primus

noun 0.559

birth

noun 0.559

natural son

noun 0.558

first name

noun 0.547

primo

noun 0.547

forefather

noun 0.544

offspring

noun 0.542

birth parent

noun 0.538

number one

noun 0.535

numero uno

noun 0.532

primero

noun 0.530

primary

noun 0.528

first mover

noun 0.527

first thing

noun 0.525

unborn

noun 0.525

progenitor

noun 0.523

princeps

noun 0.523

primipara

noun 0.522

first woman

noun 0.521

progeny

noun 0.519

birth mother

noun 0.518

stillborn

noun 0.517

ancestor

noun 0.517

primigravid

noun 0.516

first choice

noun 0.515

first fiddle

noun 0.515

primordial

noun 0.514

little brother

noun 0.514

younger

noun 0.514

primeur

noun 0.513

begetter

noun 0.511

birthright

noun 0.507

home child

noun 0.506

one-year-old

noun 0.506

primal

noun 0.506

first language

noun 0.506

first blood

noun 0.505

parent

noun 0.504

forebear

noun 0.504

forename

noun 0.503