Estate Planning for When ‘Baby Oops’ Comes Along
Here are four estate planning tasks to keep in mind to ensure Baby Oops gets what they need if you become incapacitated or pass away.
You’re likely all too familiar with the concept. Most families have children with fairly narrow age gaps. The median age gap between children is just 24 to 29 months. But every now and then, after it seems apparent to everyone — including the parents — that the family is fully formed, along comes Baby Oops 10 years later, and two kids becomes three as everyone rejoices.
Parents and grandparents should be mindful amid the pomp and circumstance of the new baby’s arrival, however. There are important estate planning considerations attached to having a child roughly a decade younger than their siblings. Throughout Baby Oops’ childhood, they’ll be at a substantially different stage of life than other siblings and will likely have different needs as a result.
For anyone who finds themselves or their adult children in this situation, here’s a short checklist of what you need to keep in mind:
From just $107.88 $24.99 for Kiplinger Personal Finance
Become a smarter, better informed investor. Subscribe from just $107.88 $24.99, plus get up to 4 Special Issues
Sign up for Kiplinger’s Free Newsletters
Profit and prosper with the best of expert advice on investing, taxes, retirement, personal finance and more - straight to your e-mail.
Profit and prosper with the best of expert advice - straight to your e-mail.
1. Make sure you update your beneficiary designations.
Unlike your last will and testament, which often does take into account the possibility of there being future children on the horizon, your beneficiary designations may not offer the same convenience. Take your life insurance policy, for example. Your life insurance policy isn’t a probate asset, so it’s not covered by your will. Let’s say you’ve left the proceeds of your life insurance policy to each of your first two children by designating them as your beneficiaries: Your will might automatically account for Baby Oops, but your life insurance policy won’t.
You’d be surprised how often this becomes a problem, and it’s what people overlook the most, based on my experience. Make sure not to accidentally forget to add Baby Oops to your life insurance policy or any other non-probate assets.
2. Think about updating guardians for your children in your will.
It’s one thing to designate the grandparents as the guardians for your 9- and 10-year-olds in case anything happens to you. Kids are fairly independent by this age, and any parent knows that caring for a fifth grader is very different than taking care of a baby. For making sure children are doing their homework and getting to soccer practice, grandparents may be appropriate guardians.
However, for constantly running around and even rolling on the floor to play with a baby and change diapers, grandparents may not be ideal guardians, while a sibling might be. This is one of the most significant areas of the age gap having an effect.
3. Have another look at all of your fiduciary appointments.
Sure, usually when you hear the word “fiduciary,” you probably think first of a financial adviser. In this instance, we’re referring to your executor, your trustee — all of the people you name to carry out your various estate planning wishes.
Now, maybe you’ve given that designation to your 16- or 17-year-old, provided they’ve reached the age of 18 when the time comes. With Baby Oops, maybe you also want to appoint them when they attain the age of 18. This way, all of your children — once they’ve become adults — can work together as your fiduciaries. To do this, you’ll want to update your appointments so that Baby Oops can be part of the process.
4. Consider a pot trust to ensure fairness for your children.
If you have older children, you’ve probably paid for many of their expenses already, while Baby Oops didn’t have the benefit of receiving many of the same things you paid for. That’s where a pot trust comes in. It’s basically a pot of funds for all of your named beneficiaries, managed by a trustee, where the trustee has the power to determine how assets are distributed.
This allows for desired complexity when slicing up the pie equally after you’re gone might not actually be the fairest method of doing things.
Takeaway
Having an unexpected, late addition to your happy family is a source of joy that is in so many ways a gift. But with enough of an age gap between children, there will be half a generation between your oldest and youngest. In the event that you pass away or become incapacitated, the youngest child’s needs will be very different.
So if Baby Oops does come along for you or someone close to you, don’t forget to have a close look at your estate planning documents to make sure everything is exactly as you wish it to be.
Profit and prosper with the best of Kiplinger's advice on investing, taxes, retirement, personal finance and much more. Delivered daily. Enter your email in the box and click Sign Me Up.

Allison L. Lee is the Attorney-at-Law, Director Trusts & Estate Content for FreeWill, a mission-based public benefit corporation that partners with nonprofits to provide a simple, intuitive and efficient online self-help platform to create wills and other estate planning documents free of cost. Through its work democratizing access to these tools, FreeWill has helped raise billions for charity. Prior to joining FreeWill, Allison spent more than a decade in private practice.
-
How to Plan a Microvacation That Actually Feels RestfulHow a simple long weekend can boost your mood, reduce stress and make winter feel shorter.
-
We're retired and fight more than ever. Should we take a break?Can taking a break save a marriage? We asked professional relationship therapists for advice.
-
Turning 59½: 5 Planning Moves Most Pre-Retirees OverlookAge 59½ isn't just when you can access your retirement savings tax-free. It also signals the start of retirement planning opportunities you shouldn't miss.
-
Turning 59½: 5 Planning Moves Most Pre-Retirees OverlookAge 59½ isn't just when you can access your retirement savings tax-free. It also signals the start of retirement planning opportunities you shouldn't miss.
-
Are Your Retirement Numbers Not Looking Good? A Financial Adviser Runs Through Your OptionsIf you're worried about a shortfall between your income and expenses in retirement, you're not alone. But there are ways you can make up the difference.
-
How to Make the Most of These 2 Tax Breaks ASAP (They Have Expiration Dates)Taxpayers can strategically use these temporary tax opportunities in particular to lock in long-term tax savings. Here's how.
-
What Changed on January 1: Check Out These Opportunities Created by the New Tax LawA deep dive into the One Big Beautiful Bill Act (OBBBA) reveals key opportunities in 2026 and beyond.
-
Beat the Money Blues With This Easy Financial Check-In to Get 2026 Off to a Good StartAs 2026 takes off, half of Americans are worried about the cost of everyday goods. A simple budget can help you beat the money blues and reach long-term goals.
-
Do Self-Storage REITs Deserve Space in Your Portfolio? It's a Yes From This Investment AdviserSelf-storage is an overlooked area of the real estate market, even though demand is strong. Investors can get in on the action through a REIT.
-
4 Simple Money Targets to Aim for in 2026 (And How to Hit Them), From a Financial PlannerWhile January is the perfect time to strengthen your financial well-being, you're more likely to succeed if you set realistic goals and work with a partner.
-
Estate Planning Isn't Just for the Ultra-WealthyIf you've acquired assets over time, even just a home and some savings, you have an estate. That means you need a plan for that estate for your beneficiaries.