Your first child is on the way, and between the registry and the nursery the actual numbers never come up: what the first year costs, which deadlines start ticking the day of the birth, and which tax rules hand some of the money back. The costs are knowable in advance, and the offsets are worth thousands — but only if you claim them on time.
Where the money goes
| Cost | Examples | Shape |
|---|---|---|
| One-time setup | Crib, car seat, stroller, first clothes | A front-loaded burst, much of it before the birth, much of it giftable or secondhand |
| Ongoing essentials | Diapers, formula and food, clothes as they grow, copays | A new monthly line in your budget |
| Childcare | Daycare, a nanny, or the income one of you gives up to stay home | The largest line, often the size of your rent |
The registry is the smallest of the three. Childcare is the one that reshapes a household: full-time daycare in many areas costs as much as rent, and staying home costs the paycheck that stops. Name that number early, before the baby arrives, and the rest of the plan falls into place around it.
The deadlines that start at the birth
| Deadline | Window | What happens |
|---|---|---|
| Add the baby to your health plan | At least 30 days on an employer plan; 60 days on HealthCare.gov | Coverage is effective from the date of birth if you enroll in time |
| Social Security number | At the hospital | Say yes when the birth-certificate paperwork asks; the card arrives by mail |
| New W-4 | Whenever your situation changes | Claiming the child in Step 3 lowers the tax withheld from each paycheck now, instead of waiting for a refund |
| Parental leave | Before the leave starts | Confirm in writing which weeks are paid and which are unpaid |
Health insurance. A birth is a qualifying life event. An employer plan has to give you at least 30 days to request enrollment and must make the baby's coverage effective from the date of birth; on HealthCare.gov you have 60 days and coverage can start the day of the birth. Miss the window and the baby is uninsured until the next open enrollment — choosing a plan during open enrollment covers those dates.
The Social Security number. Apply at the hospital, when you give the information for the birth certificate: the hospital sends the application to Social Security for you. The number is required to claim the child as a dependent and for the Child Tax Credit, and it has to be issued before your tax return is due.
Your W-4. The IRS recommends a new W-4 whenever your personal or financial situation changes, and a child is the classic case. Claiming the child in Step 3 reduces your withholding from the next paycheck onward; the paycheck calculator shows what the change does to your take-home, and the IRS Tax Withholding Estimator checks the whole year.
Leave. The federal Family and Medical Leave Act (FMLA) gives you up to 12 workweeks of unpaid, job-protected leave in a 12-month period for the birth of a child and bonding within the first year, with your group health insurance continued on the same terms. It applies if your employer has 50 or more employees (public agencies and schools regardless of size), you have worked there at least 12 months and 1,250 hours in the past 12 months, and your worksite has 50 employees within 75 miles. Paid leave comes from your employer's own policy or your state's paid-family-leave program, not from FMLA, so confirm which weeks are paid before the leave starts: unpaid weeks come straight out of your cash cushion.
The tax rules that hand money back
Child Tax Credit. For 2025 the tax credit is $2,200 per qualifying child under 17 at the end of the year, and you get the full amount if your income is $200,000 or less ($400,000 on a joint return). If the credit is more than the tax you owe, the refundable part — the Additional Child Tax Credit — pays out up to $1,700 per child, provided you have at least $2,500 of earned income. You, your spouse if you file jointly, and the child each need a Social Security number valid for employment.
Dependent-care FSA and the child and dependent care credit. Two rules cover childcare that lets you work, for a child under 13, and they overlap. A dependent-care FSA through an employer pays $5,000 of care per household for 2025 with pre-tax money, and $7,500 for plan years starting in 2026. The child and dependent care credit is worth 20% to 35% of at most $3,000 of expenses for one child ($6,000 for two or more), and the rate is 20% once your adjusted gross income is $43,000 or more. Expenses you paid through the FSA are subtracted from the credit's $3,000 expense cap, so with one child a full $5,000 election leaves no credit — and, as Sam and Riley found, the FSA saves more for anyone in the 12% bracket or higher. Pre-tax accounts and perks covers how to elect it.
Two protections that matter more now
An emergency fund sized to your old spending is now too small: Sam and Riley's monthly costs rose by $1,700, so three months of expenses is $5,100 more than it was. A job loss or a medical surprise now lands on three people, and the emergency fund calculator resizes the target in a minute; building and protecting an emergency fund covers how to rebuild it.
Someone now depends on your income, which is what life and disability insurance are for. Life insurance replaces your income for your child if you die; disability insurance replaces part of it if you cannot work. Name the beneficiary on each policy and on your retirement accounts, and name a guardian in a will. Life insurance without the sales pitch and disability and the insurance you overlook cover how each works.